Search for magnetic monopoles in root s=7 TeV pp collisions with the ATLAS Detector

EUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)

CERN-PH-EP-2012-177

Submitted to: Physical Review Letters

Search for magnetic monopoles in

√

s = 7

TeV

pp

collisions

with the ATLAS detector

The ATLAS Collaboration

Abstract

This Letter presents a search for magnetic monopoles with the ATLAS detector at the CERN

Large Hadron Collider using an integrated luminosity of 2.0 fb

of pp collisions recorded at a

center-of-mass energy of

√

s = 7

TeV. No event is found in the signal region, leading to an upper limit

on the production cross section at 95% confidence level of 1.6/ fb for Dirac magnetic monopoles

with the minimum unit magnetic charge and with mass between 200 GeV and 1500 GeV, where 

is the monopole reconstruction efficiency. The efficiency  is high and uniform in the fiducial region

given by pseudorapidity |η| < 1.37 and transverse kinetic energy 600–700 < E

_{sin θ < 1400}

_GeV.

The minimum value of 700 GeV is for monopoles of mass 200 GeV, whereas the minimum value of

600

GeV is applicable for higher mass monopoles. Therefore, the upper limit on the production cross

section at 95% confidence level is 2 fb in this fiducial region. Assuming the kinematic distributions

from Drell-Yan pair production of spin-1/2 Dirac magnetic monopoles, the efficiency is in the range

1%–10%, leading to an upper limit on the cross section at 95% confidence level that varies from

145 fb to 16 fb for monopoles with mass between 200 GeV and 1200 GeV. This limit is weaker than

the fiducial limit because most of these monopoles lie outside the fiducial region.

Search for magnetic monopoles in

s = 7 TeV pp collisions with the ATLAS detector

This Letter presents a search for magnetic monopoles with the ATLAS detector at the CERN Large Hadron Collider using an integrated luminosity of 2.0 fb−1of pp collisions recorded at a center-of-mass energy of √s = 7 TeV. No event is found in the signal region, leading to an upper limit on the production cross section at 95% confidence level of 1.6/ fb for Dirac magnetic monopoles with the minimum unit magnetic charge and with mass between 200 GeV and 1500 GeV, where  is the monopole reconstruction efficiency. The efficiency  is high and uniform in the fiducial region given by pseudorapidity |η| < 1.37 and transverse kinetic energy 600–700 < Ekinsin θ < 1400 GeV. The minimum value of 700 GeV is for monopoles of mass 200 GeV, whereas the minimum value of 600 GeV is applicable for higher mass monopoles. Therefore, the upper limit on the production cross section at 95% confidence level is 2 fb in this fiducial region. Assuming the kinematic distributions from Drell-Yan pair production of spin-1/2 Dirac magnetic monopoles, the efficiency is in the range 1%–10%, leading to an upper limit on the cross section at 95% confidence level that varies from 145 fb to 16 fb for monopoles with mass between 200 GeV and 1200 GeV. This limit is weaker than the fiducial limit because most of these monopoles lie outside the fiducial region.

PACS numbers: 14.80.Hv, 13.85.Rm, 29.20.db, 29.40.Cs

Magnetic monopoles have long been the subject of ded-icated search efforts for three main reasons: their intro-duction into the theory of electromagnetism would re-store the symmetry between electricity and magnetism in Maxwell’s equations; their existence would explain the quantization of electric charge [1]; and they appear in many grand unified theories [2]. However, to date no experimental evidence of a magnetically charged object exists.

Recent searches for magnetic monopoles from astro-physical sources [3–9] are complemented by searches at colliders [10–14]. This Letter describes a search for mag-netic monopoles in proton–proton collisions recorded at a center-of-mass energy of√s = 7 TeV using the ATLAS detector at the CERN Large Hadron Collider (LHC).

The Dirac quantization condition [1], given in Gaus-sian units, leads to a prediction for the minimum unit magnetic charge g: ge ~c = 1 2 ⇒ g e = 1 2αe ≈ 68.5, (1)

where e is the unit electric charge and αe is the fine

structure constant. With the introduction of a magnetic monopole, the duality of Maxwell’s equations implies a magnetic coupling [15] αm= (gβ)2 ~c = 1 4αe β2, (2)

where β = v/c is the monopole velocity. For relativistic monopoles, αmis very large, precluding any perturbative

calculation of monopole production processes. Therefore, the main result of this analysis is a fiducial cross-section limit for Dirac monopoles of magnetic charge g derived without assuming a particular production mechanism. A cross-section limit assuming the kinematic distribu-tions from Drell-Yan monopole pair production is also provided.

Monopoles are highly ionizing particles, interacting with matter like an ion of electric charge 68.5e, according to Eq. 1. The high stopping power of the monopole ion-ization [16] results in the production of a large number of δ-rays. These energetic “knock-on” electrons emitted from the material carry away energy from the monopole trajectory and further ionize the medium. In the mass and energy regime of this study, the δ-rays have ki-netic energies ranging from 1 MeV to a maximum of ∼ 100 MeV. The secondary ionization by these δ-rays represents a significant fraction of the ionization energy loss of the magnetic monopole [16]. The dominant en-ergy loss mechanism for magnetic monopoles in the mass and energy range considered herein is ionization [16–18]. Furthermore, the monopole ionization is independent of the monopole speed β to first order, in contrast to the ionization of electrically charged particles.

In the ATLAS detector [19, 20], the monopole signa-ture can be easily distinguished using the transition radi-ation tracker (TRT) in the inner detector and the liquid argon (LAr) sampling electromagnetic (EM) calorimeter. The TRT is a straw-tube tracker that comprises a barrel (|η| < 1.0) with 4 mm diameter straws oriented parallel to the beam-line, and two endcaps (0.8 < |η| < 2.0) with straws orientated radially. A minimum ionizing parti-cle deposits ∼ 2 keV of energy in a TRT straw. En-ergy deposits in a TRT straw greater than 200 eV (called “low-threshold hits”) are used for tracking, while those that exceed 6 keV (called “high-threshold hits”) typi-cally occur due to the transition radiation emitted by highly relativistic electrons when they penetrate the ra-diator layers between the straws. As a result, an elec-tron of energy 5 GeV or above has a 20% probability of producing a high-threshold hit in any straw it traverses. The high-threshold hits can also indicate the presence of a highly ionizing particle. A 2 T superconducting

solenoid magnet surrounds the inner detector. The LAr barrel EM calorimeter lies outside the solenoid in the |η| < 1.5 region. It is divided into three shower-depth lay-ers and comprises accordion-shaped electrodes and lead absorbers. The cell granularity in the second layer is ∆η × ∆φ = 0.025 × 0.025. The characteristic signature of magnetic monopoles in ATLAS is a large localized energy deposit in the LAr EM calorimeter (EM cluster) in con-junction with a region of high ionization density in the TRT. A search for particles with large electric charge, which yield a similar signature, was performed previ-ously [21] and production cross-section limits for such particles were set [22].

The trajectory of an electrically neutral magnetic monopole in the inner detector is straight in the r–φ plane and curved in r–z. The behavior of magnetic monopoles in the ATLAS detector is described by a Geant4 [23] simulation [24], which includes the equations of motion, the ionization, the δ-ray production and a modified Birks’ Law [25] to model recombination effects in LAr due to highly ionizing particles [26]. Equation 5.5 in Ref. [16] gives the δ-ray production cross section and Eq. 5.7 de-scribes the derivation of the magnetic monopole ioniza-tion; both equations are implemented in Geant4.

Simulated Monte Carlo (MC) single-monopole sam-ples are used to determine the efficiency as a function of the transverse kinetic energy Ekin

T = Ekinsin θ and

pseudorapidity η for various monopole masses. For the Drell-Yan process, it is assumed that spin-1/2 magnetic monopoles are produced in pairs from the initial pp state via quark-antiquark annihilation into a virtual photon. MadGraph [27] is used to model this process by assum-ing leadassum-ing-order Drell-Yan heavy lepton pair production but making the replacement e → gβ to reflect the mag-netic coupling in Eq. 2. In the absence of a consistent theory describing the coupling of the monopole to the Z boson, such a coupling is set to zero in the MadGraph model. In the Drell-Yan samples, the CTEQ6L1 [28] par-ton distribution functions are used and Pythia version 6.425 [29] is used for the hadronization and the under-lying event. Only Drell-Yan monopoles with transverse momentum pT > 200 GeV are processed by the

simula-tion since lower pTmonopoles fail to reach the

calorime-ter. For all the simulated samples, both the monopoles and the antimonopoles are assumed to be stable and all final-state particles are processed by the simulation of the ATLAS detector. Additional pp collisions in each event are simulated according to the distribution of pp interac-tions per bunch crossing in the selected data period.

A simple algorithm is used to preselect events with monopole candidates for further study. Monopoles with Ekin

T above approximately 500 GeV traverse the inner

de-tector and penetrate to the LAr calorimeter, depositing most of their energy there. Only one third of the de-posited energy is recorded due to the recombination ef-fects in LAr [26]. Lacking a dedicated monopole trigger,

only events collected with a single-electron trigger with transverse energy threshold ET> 60 GeV are considered.

This trigger requires a track in the inner detector within |∆η| < 0.01 and |∆φ| < 0.02 of the LAr energy deposit. Monopoles that fulfill the 60 GeV energy requirement travel fast enough to satisfy the tracking and timing re-quirements of the trigger. Very high energy monopoles (i.e., those with Ekin

T & 1400–1900 GeV, where the value

of 1400 GeV is for monopoles of mass 1500 GeV and the value of 1900 GeV is for monopoles of mass 200 GeV) exit the EM calorimeter and are rejected by a veto on hadronic energy that is intrinsic to the single-electron trigger. This trigger was operational during the first six months of 2011 data-taking and recorded an integrated luminosity of 2.0 fb−1, defining the dataset used for this search.

The reconstructed EM cluster is then required to have ET > 65 GeV and |η| < 1.37. The trigger efficiency is

independent of ET for ET> 65 GeV, motivating the

for-mer requirement. The η requirement ensures that the EM cluster is in the barrel region of the LAr calorimeter, where the two-dimensional spatial resolution is uniform. If two or more EM clusters in an event satisfy these crite-ria, only the cluster with the highest energy is considered as a monopole candidate.

In the barrel region, the monopole typically traverses 35 TRT straws and its high ionization ensures that most of these register high-threshold hits. Furthermore, as each δ-ray produced by the monopole ionization deposits ∼ 2 keV in a straw, the combined energy deposited by multiple δ-rays crossing a single TRT straw gives rise to additional high-threshold hits. The large number of δ-rays bend in the 2 T magnetic field in the r–φ plane; therefore, the monopole trajectory appears as a ∼ 1-cm-wide swath of high-threshold TRT hits. The fraction of TRT hits that exceed the high threshold in the vicinity of the path of an ionizing particle is therefore a power-ful discriminator between the monopole signal and the background. The φ position of the EM cluster is used to define a road of width ∆φ = ±0.05 rad from the beam-line to the cluster. At least twenty high-threshold TRT hits must be present in the road. In addition, at least 20% of the TRT hits in the road must be high-threshold hits.

After the preselection, a more refined TRT hit count-ing algorithm is used to distcount-inguish the signal from the backgrounds. A histogram with a bin width of 0.8 mrad is filled with the φ distribution of the high-threshold hits in the previously defined road. The location of the high-est bin is used to calculate the center of a new road. In the TRT barrel, a rectangular road of ±4 mm in the r–φ plane is used and the hits are counted. In the TRT end-cap, a wedge-shaped road of width ∆φ = ±0.006 rad is used. These roads are wide enough to encompass two neighboring straws, taking into account the monopole trajectory and the associated δ-rays, but sufficiently

nar-row to ensure that the fraction of hits that exceed the high threshold, fHT, is insensitive to the presence of

neighboring tracks. In the barrel region, the number of hits in the road is required to be greater than 54. An η-dependent requirement on the number of hits in the road is applied in the endcap and barrel–endcap transi-tion region to account for the TRT geometry.

Energy loss by bremsstrahlung and e+_e− _pair

produc-tion is negligible for magnetic monopoles in the mass and energy range considered herein. Therefore, mag-netic monopoles give rise to a narrow ionization energy deposit in the LAr calorimeter, the size of which pro-vides another powerful discriminator of the monopole signal from backgrounds such as electrons and photons, which induce an EM shower via bremsstrahlung and e+e− pair production. The variable used is σR, the

energy-weighted two-dimensional η–φ cluster dispersion in the second layer of the EM calorimeter, which has the highest two-dimensional spatial resolution. The dis-persion σR is calculated from the energies deposited in

a 3 × 7 array of cells centered around the most ener-getic cell of the EM cluster: σR =

q σ2

φ+ σ2η, where

σ2

φ= Σ Eiδφ2i
/ΣEi− [Σ (Eiδφi) /ΣEi]2, δφi is the

de-viation in φ between cell i and the most energetic cell and Ei is the energy of cell i; ση2is defined similarly.

The high-threshold TRT hit fraction, fHT, and the

cluster dispersion, σR, are thus chosen as the

distinguish-ing variables between the signal and background, and are shown in Fig. 1. The main physics background sources are high-energy electrons, photons and jets, which exhibit no correlation between these variables in simulated pro-cesses. The background and monopole MC samples are used to define an approximate signal region. Then (σR,

fHT) parameter pairs are generated by randomly

sam-pling the one-dimensional σR and fHT distributions for

data outside this approximate signal region. The borders of the signal region are tuned for maximal significance of observation of three signal events by replacing the back-ground MC events with these parameter pairs. The final signal region A is defined by σR≤ 0.017 and fHT> 0.7.

The efficiencies, which include trigger, reconstruction and selection effects, in the two-dimensional Ekin_T versus η plane are obtained from the simulated single-monopole samples. A fiducial region for each monopole mass is de-fined by the E_Tkin range in which the efficiency is 0.80 or higher in the |η| < 1.37 region. Figure 2 shows the efficiency versus Ekin

T , averaged over |η| < 1.37. For

monopoles with a mass of 200 GeV, the minimum trans-verse kinetic energy (Ekin

T )min where the efficiency rises

above 0.80 is 700 GeV. For monopoles with a mass be-tween 500 GeV and 1500 GeV, (Ekin

T )min is 600 GeV.

Monopoles with lower Ekin

T fail to penetrate to the EM

calorimeter and therefore do not satisfy the trigger re-quirements. Monopoles with very high Ekin

T exit the

EM calorimeter and are rejected by the hadronic veto

R σ 0 0.01 0.02 0.03 0.04 HT f 0 0.2 0.4 0.6 0.8 1 Data 2011 Monopole MC A C D B ATLAS -1 L dt = 2.0 fb = 7 TeV s

∫

FIG. 1. High-threshold TRT hit fraction, fHT, versus EM

cluster dispersion, σR. The circles represent 1000 simulated

single monopoles with mass 800 GeV. The crosses represent ATLAS data. The regions marked A-D are discussed in the text. [GeV] kin T E 0 500 1000 1500 2000 2500 3000 E ff ic ie n c y 0 0.2 0.4 0.6 0.8 1 1.2 ATLAS Simulation

Monopole mass 200 GeV Monopole mass 1500 GeV

FIG. 2. Efficiency versus Ekin

T , averaged over |η| < 1.37, for

single monopoles of mass 200 GeV and mass 1500 GeV.

of the electron trigger. A common upper value of E_Tkin = 1400 GeV is used for the fiducial region of all monopole masses. As the minimum efficiency is 0.80 in the fiducial region, a common value of 0.80 is used in the determina-tion of the upper cross-secdetermina-tion limit.

The efficiencies can be under- or over-estimated for sev-eral reasons. These effects are described below and the relative systematic uncertainties for each effect are given. 1) Cross-talk in the second EM layer in the φ direction is not modeled in the simulation. The energy is reweighted assuming 1.8% cross-talk [30] and the cluster dispersion, σR, recomputed. The efficiency is reduced and the

taken as a one-sided uncertainty. 2) The simulation un-derestimates the TRT occupancy in the data by up to 20%; therefore, the number of low-threshold hits (those unlikely to come from the monopole or related δ-rays) is increased by 20%. The resulting relative uncertainty is −1.3%. 3) The modification to Birks’ Law is var-ied between its upper and lower systematic uncertain-ties [26], yielding a relative uncertainty of +1.8% and +1.5%, respectively. 4) The production of δ-rays is var-ied by 3% [16] and the resulting uncertainty is negligible. 5) The Geant4 “range cut” [23] controls the minimum kinetic energy threshold below which δ-rays are not prop-agated explicitly. This parameter is reduced from 50 µm to 25 µm in the TRT simulation. The resulting relative uncertainty is +0.14%. 6) The material in the inner de-tector, in the barrel cryostat and in between the cryostat and the first layer of the EM calorimeter is increased by 5%, 10% and 5%, respectively, in the simulation [31]. The resulting −0.74% relative uncertainty is taken as sym-metric. Including an uncertainty of ∼ 1.7% to account for the limited number of MC events, the total upper and lower relative uncertainties on the efficiency for sin-gle monopoles are +2.6% and −2.8%, respectively.

The efficiencies to reconstruct at least one of the monopoles in the pairs produced with Drell-Yan kine-matic distributions are given in Table I for each mass. Only masses up to 1200 GeV are considered, taking into account the phase space limitations for pair production. The total relative uncertainties, which reflect the same systematic variations described above, are also given. The efficiencies and their associated systematic uncer-tainties reflect large losses due to acceptance, since many Drell-Yan monopoles have insufficient energy to reach the calorimeter.

TABLE I. Efficiencies and their relative uncertainties in per-cent for Drell-Yan pair-produced monopoles of various masses.

Mass (GeV) 200 500 800 1000 1200 Efficiency 0.011 0.048 0.081 0.095 0.095 Relative uncertainty

Upper (%) +32 +24 +22 +23 +20 Lower (%) −36 −23 −22 −25 −25

The background in the signal region is predicted di-rectly from the data. The two-dimensional plane in Fig. 1 is divided into quadrants, one of which is dominated by signal (region A), and three others that are occupied mainly by background (regions B, C and D). The ra-tio of background events in signal region A to events in background region B is expected to be the same as the ratio of background events in regions C to D. This as-sumption is incorporated into a maximum likelihood fit to determine the estimated numbers of signal and back-ground events in signal region A. The inputs to the fit include the observed event yields in quadrants A through

D, which are 0, 5, 16 and 7001, respectively, the efficien-cies and associated systematic uncertainties that have al-ready been discussed, and the integrated luminosity and its 3.7% uncertainty [32]. For each monopole mass, the rate of appearance of signal events in quadrants B and C, as predicted by the simulation, is also taken into account. According to the simulation, no signal event appears in quadrant D for any monopole mass. The fit predicts 0.011 ± 0.007 background events in the signal region.

Using the results of the maximum likelihood fit, the upper limits on the production cross sections at 95% con-fidence level are calculated using the profile likelihood ra-tio as a test statistic [33]. The results are extracted using the CLsmethod [34]. The cross section limits can be

ex-pressed as a function of the efficiency, , which is shown in Fig. 2 for single monopoles and given in Table I for Drell-Yan pair-produced monopoles. The upper limit on the production cross section at 95% confidence level is found to be 1.6/ fb for Dirac magnetic monopoles with the minimum unit magnetic charge and with mass between 200 GeV and 1500 GeV. Assuming the kinematic distri-butions from Drell-Yan pair production of spin-1/2 Dirac magnetic monopoles, this translates to an upper limit on the cross section at 95% confidence level that varies from 145 fb to 16 fb for monopoles with mass between 200 GeV and 1200 GeV, as shown in Fig. 3. Since the number of expected background events is very small and no event is observed in the signal region, only the observed limits are shown. To compare with previous experiments that have provided lower mass limits on spin-1/2 Dirac magnetic monopoles by assuming Drell-Yan pair production, such an approach would yield a lower mass limit of 862 GeV in the present search [35].

The monopole reconstruction efficiency is high and uniform in the fiducial region given by pseudorapidity |η| < 1.37 and transverse kinetic energy (Ekin

T )min <

Ekinsin θ < 1400 GeV, where (E_Tkin)min is 600 GeV for

monopoles with a mass between 500 GeV and 1500 GeV. For monopoles with a mass of 200 GeV, (E_Tkin)min =

700 GeV. Therefore, the upper limit on the production cross section at 95% confidence level is 2 fb, as shown in Fig. 3, for Dirac magnetic monopoles with the minimum unit magnetic charge and with mass between 200 GeV and 1500 GeV in this fiducial region. The fluctuations of the observed limit in the fiducial region originate from variations of the nuisance parameters used in the profile likelihood ratio.

These results extend the upper limits on the produc-tion cross secproduc-tion for monopoles in this mass region estab-lished by preceding experiments. This is the first direct collider search that yields cross-section constraints on magnetic monopoles with masses greater than 900 GeV. We thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently. We thank J. Apostolakis, V. Ivanchenko, M. Horbatsch

[GeV] m 200 400 600 800 1000 1200 1400

Monopole cross section [fb]

-1 10 1 10 2 10 10

Observed limit (DY)

ATLAS Data 2011

∫

Observed limit in fiducial region

FIG. 3. Upper limits on the monopole production cross sec-tions at 95% confidence level. The solid line is the limit for single monopoles in the fiducial region and the dashed line is the limit assuming the kinematic distributions from Drell-Yan (DY) monopole pair production.

and V. Sanz for helpful discussions.

We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONI-CYT, Chile; CAS, MOST and NSFC, China; COLCIEN-CIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Founda-tion, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Geor-gia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Rus-sia and ROSATOM, RusRus-sian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Can-tons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Lever-hulme Trust, United Kingdom; DOE and NSF, United States of America.

The crucial computing support from all WLCG part-ners is acknowledged gratefully, in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Tai-wan), RAL (UK) and BNL (USA) and in the Tier-2 fa-cilities worldwide.

[1] P.A.M. Dirac, Proc. Roy. Soc. A 133, 60 (1931). [2] G. ’t Hooft, Nucl. Phys. B 79, 276 (1974).

[3] M. Ambrosio et al. (MACRO Collaboration), Eur. Phys. J. C 25, 511 (2002).

[4] S. Balestra et al. (SLIM Collaboration), Eur. Phys. J. C 55, 57 (2008).

[5] V. Aynutdinov et al. (Baikal Collaboration), Astropart. Phys. 29, 366 (2008).

[6] D.P. Hogan, D.Z. Besson, J.P. Ralston, I. Kravchenko, and D. Seckel (RICE Collaboration), Phys. Rev. D 78, 075031 (2008).

[7] R. Abbasi et al. (IceCube Collaboration), Eur. Phys. J. C 69, 361 (2010).

[8] M. Detrixhe et al. (ANITA Collaboration), Phys. Rev. D 83, 023513 (2011).

[9] S. Adri´an-Mart´ınez et al. (ANTARES Collaboration), Astropart. Phys. 35, 634 (2012).

[10] B. Abbott et al. (D0 Collaboration), Phys. Rev. Lett. 81, 524 (1998).

[11] A. Aktas et al. (H1 Collaboration), Eur. Phys. J. C 41, 133 (2005).

[12] A. Abulencia et al. (CDF Collaboration), Phys. Rev. Lett. 96, 201801 (2006).

[13] G. Abbiendi et al. (OPAL Collaboration), Phys. Lett. B 663, 37 (2008).

[14] S. Cecchini et al. (MoEDAL Collaboration), Report No. CERN-LHCC-2009-006, 2009.

[15] G. Bauer, M.J. Mulhearn, Ch. Paus, P. Schieferdecker and S. Tether, Nucl. Instrum. Methods Phys. Res., Sect. A 545, 503 (2005).

[16] S.P. Ahlen, Phys. Rev. D 17, 229 (1978); Rev. Mod. Phys. 52, 121 (1980).

[17] N. Craigie, G. Giacomelli, W. Nahm and Q. Shafi, Theory and Detection of Magnetic Monopoles in Gauge Theories (World Scientific, 1986).

[18] G. Giacomelli and L. Patrizii, hep-ex/0302011 (2003). [19] ATLAS Collaboration, JINST 3, (2008) S08003. [20] ATLAS uses a right-handed coordinate system with its

origin at the nominal interaction point (IP) in the center of the detector and the z-axis coinciding with the axis of the beam pipe. The x-axis points from the IP to the center of the LHC ring, and the y-axis points upward. Cylindrical coordinates (r, φ) are used in the transverse plane, φ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle θ as η = − ln tan(θ/2).

[21] ATLAS Collaboration, Phys. Lett. B 698, 353 (2011). [22] A. De Roeck, A. Katre, P. Mermod, D. Milstead and

T. Sloan, Eur. Phys. J. C 72, 1985 (2012).

[23] S. Agostinelli et al. (Geant4 Collaboration), Nucl. In-strum. Methods Phys. Res., Sect. A 506, 250 (2003). [24] ATLAS Collaboration, Eur. Phys. J. C 70, 823 (2010). [25] J.B. Birks, Proc. Phys. Soc. A 64, 874 (1951); Theory

and Practice of Scintillation Counting (Pergamon, New York, 1964);J.B. Birks and F.A. Black, Proc. Phys. Soc. A 64, 511 (1951).

[26] S. Burdin, M. Horbatsch and W. Taylor, Nucl. Instrum. Methods Phys. Res., Sect. A 664, 111 (2012).

[27] J. Alwall, P. Demin, S. de Visscher, R. Frederix, M. Herquet, F. Maltoni, T. Plehn, D.L. Rainwater, and T. Stelzer, J. High Energy Phys. 09, 028 (2007).

[28] J. Pumplin, D.R. Stump, J. Huston, H.-L. Lai, P. Nadol-sky and W.-K. Tung, J. High Energy Phys. 07, 012 (2002).

[29] T. Sj¨ostrand, S. Mrenna and P.Z. Skands, J. High Energy Phys. 05, 026 (2006).

[30] M. Aharrouche et al., Nucl. Instrum. Methods Phys. Res., Sect. A 582, 429 (2007).

[31] ATLAS Collaboration, Eur. Phys. J. C 72, 1909 (2012). [32] ATLAS Collaboration, Eur. Phys. J. C 71, 1630 (2011); Report No. ATLAS-CONF-2011-116 (2011), http://

cdsweb.cern.ch/record/1376384.

[33] L. Moneta et al., in proceedings of 13th International Workshop on Advanced Computing and Analysis Tech-niques in Physics Research, PoS (ACAT2010) 057. [34] A. Read, J. Phys. G 28, 2693 (2002).

[35] Over the range of monopole masses from 200 GeV to 1200 GeV, the leading-order Drell-Yan production cross section drops from 105_{fb to 1 fb, but has large theoretical}

uncertainties, due to the non-perturbative nature of the magnetic coupling.

The ATLAS Collaboration

G. Aad47_{, T. Abajyan}20_{, B. Abbott}110_{, J. Abdallah}11_{, S. Abdel Khalek}114_{, A.A. Abdelalim}48_{, O. Abdinov}10_,

R. Aben104_{, B. Abi}111_{, M. Abolins}87_{, O.S. AbouZeid}157_{, H. Abramowicz}152_{, H. Abreu}135_{, E. Acerbi}88a,88b_,

B.S. Acharya163a,163b_{, L. Adamczyk}37_{, D.L. Adams}24_{, T.N. Addy}55_{, J. Adelman}175_{, S. Adomeit}97_{, P. Adragna}74_,

T. Adye128_{, S. Aefsky}22_{, J.A. Aguilar-Saavedra}123b,a_{, M. Agustoni}16_{, M. Aharrouche}80_{, S.P. Ahlen}21_{, F. Ahles}47_,

A. Ahmad147_{, M. Ahsan}40_{, G. Aielli}132a,132b_{, T. Akdogan}18a_{, T.P.A. ˚Akesson}78_{, G. Akimoto}154_{, A.V. Akimov}93_,

M.S. Alam1_{, M.A. Alam}75_{, J. Albert}168_{, S. Albrand}54_{, M. Aleksa}29_{, I.N. Aleksandrov}63_{, F. Alessandria}88a_,

C. Alexa25a_{, G. Alexander}152_{, G. Alexandre}48_{, T. Alexopoulos}9_{, M. Alhroob}163a,163c_{, M. Aliev}15_{, G. Alimonti}88a_,

J. Alison119_{, B.M.M. Allbrooke}17_{, P.P. Allport}72_{, S.E. Allwood-Spiers}52_{, J. Almond}81_{, A. Aloisio}101a,101b_,

R. Alon171_{, A. Alonso}78_{, F. Alonso}69_{, B. Alvarez Gonzalez}87_{, M.G. Alviggi}101a,101b_{, K. Amako}64_{, C. Amelung}22_,

V.V. Ammosov127,∗_{, A. Amorim}123a,b_{, N. Amram}152_{, C. Anastopoulos}29_{, L.S. Ancu}16_{, N. Andari}114_{, T. Andeen}34_,

C.F. Anders57b, G. Anders57a, K.J. Anderson30, A. Andreazza88a,88b, V. Andrei57a, X.S. Anduaga69, P. Anger43, A. Angerami34, F. Anghinolfi29, A. Anisenkov106, N. Anjos123a, A. Annovi46, A. Antonaki8, M. Antonelli46, A. Antonov95, J. Antos143b, F. Anulli131a, M. Aoki100, S. Aoun82, L. Aperio Bella4, R. Apolle117,c, G. Arabidze87, I. Aracena142, Y. Arai64, A.T.H. Arce44, S. Arfaoui147, J-F. Arguin14, E. Arik18a,∗, M. Arik18a, A.J. Armbruster86, O. Arnaez80_{, V. Arnal}79_{, C. Arnault}114_{, A. Artamonov}94_{, G. Artoni}131a,131b_{, D. Arutinov}20_{, S. Asai}154_,

R. Asfandiyarov172_{, S. Ask}27_{, B. ˚Asman}145a,145b_{, L. Asquith}5_{, K. Assamagan}24_{, A. Astbury}168_{, M. Atkinson}164_,

B. Aubert4_{, E. Auge}114_{, K. Augsten}126_{, M. Aurousseau}144a_{, G. Avolio}162_{, R. Avramidou}9_{, D. Axen}167_,

G. Azuelos92,d_{, Y. Azuma}154_{, M.A. Baak}29_{, G. Baccaglioni}88a_{, C. Bacci}133a,133b_{, A.M. Bach}14_{, H. Bachacou}135_,

K. Bachas29_{, M. Backes}48_{, M. Backhaus}20_{, E. Badescu}25a_{, P. Bagnaia}131a,131b_{, S. Bahinipati}2_{, Y. Bai}32a_,

D.C. Bailey157_{, T. Bain}157_{, J.T. Baines}128_{, O.K. Baker}175_{, M.D. Baker}24_{, S. Baker}76_{, E. Banas}38_{, P. Banerjee}92_,

Sw. Banerjee172_{, D. Banfi}29_{, A. Bangert}149_{, V. Bansal}168_{, H.S. Bansil}17_{, L. Barak}171_{, S.P. Baranov}93_,

A. Barbaro Galtieri14_{, T. Barber}47_{, E.L. Barberio}85_{, D. Barberis}49a,49b_{, M. Barbero}20_{, D.Y. Bardin}63_{, T. Barillari}98_,

M. Barisonzi174_{, T. Barklow}142_{, N. Barlow}27_{, B.M. Barnett}128_{, R.M. Barnett}14_{, A. Baroncelli}133a_{, G. Barone}48_,

A.J. Barr117_{, F. Barreiro}79_{, J. Barreiro Guimar˜aes da Costa}56_{, P. Barrillon}114_{, R. Bartoldus}142_{, A.E. Barton}70_,

V. Bartsch148_{, R.L. Bates}52_{, L. Batkova}143a_{, J.R. Batley}27_{, A. Battaglia}16_{, M. Battistin}29_{, F. Bauer}135_,

H.S. Bawa142,e, S. Beale97, T. Beau77, P.H. Beauchemin160, R. Beccherle49a, P. Bechtle20, H.P. Beck16,

A.K. Becker174, S. Becker97, M. Beckingham137, K.H. Becks174, A.J. Beddall18c, A. Beddall18c, S. Bedikian175, V.A. Bednyakov63, C.P. Bee82, L.J. Beemster104, M. Begel24, S. Behar Harpaz151, M. Beimforde98,

C. Belanger-Champagne84, P.J. Bell48, W.H. Bell48, G. Bella152, L. Bellagamba19a, F. Bellina29, M. Bellomo29, A. Belloni56_{, O. Beloborodova}106,f_{, K. Belotskiy}95_{, O. Beltramello}29_{, O. Benary}152_{, D. Benchekroun}134a_,

K. Bendtz145a,145b_{, N. Benekos}164_{, Y. Benhammou}152_{, E. Benhar Noccioli}48_{, J.A. Benitez Garcia}158b_,

D.P. Benjamin44_{, M. Benoit}114_{, J.R. Bensinger}22_{, K. Benslama}129_{, S. Bentvelsen}104_{, D. Berge}29_,

E. Bergeaas Kuutmann41_{, N. Berger}4_{, F. Berghaus}168_{, E. Berglund}104_{, J. Beringer}14_{, P. Bernat}76_{, R. Bernhard}47_,

C. Bernius24_{, T. Berry}75_{, C. Bertella}82_{, A. Bertin}19a,19b_{, F. Bertolucci}121a,121b_{, M.I. Besana}88a,88b_{, G.J. Besjes}103_,

N. Besson135_{, S. Bethke}98_{, W. Bhimji}45_{, R.M. Bianchi}29_{, M. Bianco}71a,71b_{, O. Biebel}97_{, S.P. Bieniek}76_,

K. Bierwagen53_{, J. Biesiada}14_{, M. Biglietti}133a_{, H. Bilokon}46_{, M. Bindi}19a,19b_{, S. Binet}114_{, A. Bingul}18c_,

C. Bini131a,131b_{, C. Biscarat}177_{, U. Bitenc}47_{, K.M. Black}21_{, R.E. Blair}5_{, J.-B. Blanchard}135_{, G. Blanchot}29_,

T. Blazek143a_{, C. Blocker}22_{, J. Blocki}38_{, A. Blondel}48_{, W. Blum}80_{, U. Blumenschein}53_{, G.J. Bobbink}104_,

V.B. Bobrovnikov106_{, S.S. Bocchetta}78_{, A. Bocci}44_{, C.R. Boddy}117_{, M. Boehler}47_{, J. Boek}174_{, N. Boelaert}35_,

J.A. Bogaerts29, A. Bogdanchikov106, A. Bogouch89,∗, C. Bohm145a, J. Bohm124, V. Boisvert75, T. Bold37, V. Boldea25a, N.M. Bolnet135, M. Bomben77, M. Bona74, M. Boonekamp135, C.N. Booth138, S. Bordoni77, C. Borer16, A. Borisov127, G. Borissov70, I. Borjanovic12a, M. Borri81, S. Borroni86, V. Bortolotto133a,133b, K. Bos104, D. Boscherini19a, M. Bosman11, H. Boterenbrood104, J. Bouchami92, J. Boudreau122,

E.V. Bouhova-Thacker70, D. Boumediene33, C. Bourdarios114, N. Bousson82, A. Boveia30, J. Boyd29, I.R. Boyko63, I. Bozovic-Jelisavcic12b_{, J. Bracinik}17_{, P. Branchini}133a_{, A. Brandt}7_{, G. Brandt}117_{, O. Brandt}53_{, U. Bratzler}155_,

B. Brau83_{, J.E. Brau}113_{, H.M. Braun}174,∗_{, S.F. Brazzale}163a,163c_{, B. Brelier}157_{, J. Bremer}29_{, K. Brendlinger}119_,

R. Brenner165_{, S. Bressler}171_{, D. Britton}52_{, F.M. Brochu}27_{, I. Brock}20_{, R. Brock}87_{, F. Broggi}88a_{, C. Bromberg}87_,

J. Bronner98_{, G. Brooijmans}34_{, T. Brooks}75_{, W.K. Brooks}31b_{, G. Brown}81_{, H. Brown}7_,

P.A. Bruckman de Renstrom38_{, D. Bruncko}143b_{, R. Bruneliere}47_{, S. Brunet}59_{, A. Bruni}19a_{, G. Bruni}19a_,

M. Bruschi19a_{, T. Buanes}13_{, Q. Buat}54_{, F. Bucci}48_{, J. Buchanan}117_{, P. Buchholz}140_{, R.M. Buckingham}117_,

A.G. Buckley45_{, S.I. Buda}25a_{, I.A. Budagov}63_{, B. Budick}107_{, V. B¨uscher}80_{, L. Bugge}116_{, O. Bulekov}95_,

A.C. Bundock72_{, M. Bunse}42_{, T. Buran}116_{, H. Burckhart}29_{, S. Burdin}72_{, T. Burgess}13_{, S. Burke}128_{, E. Busato}33_,

P. Bussey52_{, C.P. Buszello}165_{, B. Butler}142_{, J.M. Butler}21_{, C.M. Buttar}52_{, J.M. Butterworth}76_{, W. Buttinger}27_,

L.P. Caloba , R. Caloi , D. Calvet , S. Calvet , R. Camacho Toro , P. Camarri , D. Cameron , L.M. Caminada14, S. Campana29, M. Campanelli76, V. Canale101a,101b, F. Canelli30,g, A. Canepa158a, J. Cantero79, R. Cantrill75_{, L. Capasso}101a,101b_{, M.D.M. Capeans Garrido}29_{, I. Caprini}25a_{, M. Caprini}25a_{, D. Capriotti}98_,

M. Capua36a,36b_{, R. Caputo}80_{, R. Cardarelli}132a_{, T. Carli}29_{, G. Carlino}101a_{, L. Carminati}88a,88b_{, B. Caron}84_,

S. Caron103_{, E. Carquin}31b_{, G.D. Carrillo Montoya}172_{, A.A. Carter}74_{, J.R. Carter}27_{, J. Carvalho}123a,h_,

D. Casadei107_{, M.P. Casado}11_{, M. Cascella}121a,121b_{, C. Caso}49a,49b,∗_{, A.M. Castaneda Hernandez}172,i_,

E. Castaneda-Miranda172_{, V. Castillo Gimenez}166_{, N.F. Castro}123a_{, G. Cataldi}71a_{, P. Catastini}56_{, A. Catinaccio}29_,

J.R. Catmore29_{, A. Cattai}29_{, G. Cattani}132a,132b_{, S. Caughron}87_{, V. Cavaliere}164_{, P. Cavalleri}77_{, D. Cavalli}88a_,

M. Cavalli-Sforza11_{, V. Cavasinni}121a,121b_{, F. Ceradini}133a,133b_{, A.S. Cerqueira}23b_{, A. Cerri}29_{, L. Cerrito}74_,

F. Cerutti46_{, S.A. Cetin}18b_{, A. Chafaq}134a_{, D. Chakraborty}105_{, I. Chalupkova}125_{, K. Chan}2_{, B. Chapleau}84_,

J.D. Chapman27_{, J.W. Chapman}86_{, E. Chareyre}77_{, D.G. Charlton}17_{, V. Chavda}81_{, C.A. Chavez Barajas}29_,

S. Cheatham84_{, S. Chekanov}5_{, S.V. Chekulaev}158a_{, G.A. Chelkov}63_{, M.A. Chelstowska}103_{, C. Chen}62_{, H. Chen}24_,

S. Chen32c, X. Chen172, Y. Chen34, A. Cheplakov63, R. Cherkaoui El Moursli134e, V. Chernyatin24, E. Cheu6, S.L. Cheung157, L. Chevalier135, G. Chiefari101a,101b, L. Chikovani50a,∗, J.T. Childers29, A. Chilingarov70,

G. Chiodini71a, A.S. Chisholm17, R.T. Chislett76, A. Chitan25a, M.V. Chizhov63, G. Choudalakis30, S. Chouridou136, I.A. Christidi76, A. Christov47, D. Chromek-Burckhart29, M.L. Chu150, J. Chudoba124, G. Ciapetti131a,131b,

A.K. Ciftci3a, R. Ciftci3a, D. Cinca33, V. Cindro73, C. Ciocca19a,19b, A. Ciocio14, M. Cirilli86, P. Cirkovic12b, M. Citterio88a_{, M. Ciubancan}25a_{, A. Clark}48_{, P.J. Clark}45_{, R.N. Clarke}14_{, W. Cleland}122_{, J.C. Clemens}82_,

B. Clement54_{, C. Clement}145a,145b_{, Y. Coadou}82_{, M. Cobal}163a,163c_{, A. Coccaro}137_{, J. Cochran}62_{, J.G. Cogan}142_,

J. Coggeshall164_{, E. Cogneras}177_{, J. Colas}4_{, S. Cole}105_{, A.P. Colijn}104_{, N.J. Collins}17_{, C. Collins-Tooth}52_{, J. Collot}54_,

T. Colombo118a,118b_{, G. Colon}83_{, P. Conde Mui˜no}123a_{, E. Coniavitis}117_{, M.C. Conidi}11_{, S.M. Consonni}88a,88b_,

V. Consorti47_{, S. Constantinescu}25a_{, C. Conta}118a,118b_{, G. Conti}56_{, F. Conventi}101a,j_{, M. Cooke}14_{, B.D. Cooper}76_,

A.M. Cooper-Sarkar117_{, K. Copic}14_{, T. Cornelissen}174_{, M. Corradi}19a_{, F. Corriveau}84,k_{, A. Cortes-Gonzalez}164_,

G. Cortiana98_{, G. Costa}88a_{, M.J. Costa}166_{, D. Costanzo}138_{, T. Costin}30_{, D. Cˆot´e}29_{, L. Courneyea}168_{, G. Cowan}75_,

C. Cowden27_{, B.E. Cox}81_{, K. Cranmer}107_{, F. Crescioli}121a,121b_{, M. Cristinziani}20_{, G. Crosetti}36a,36b_,

S. Cr´ep´e-Renaudin54_{, C.-M. Cuciuc}25a_{, C. Cuenca Almenar}175_{, T. Cuhadar Donszelmann}138_{, M. Curatolo}46_,

C.J. Curtis17_{, C. Cuthbert}149_{, P. Cwetanski}59_{, H. Czirr}140_{, P. Czodrowski}43_{, Z. Czyczula}175_{, S. D’Auria}52_,

M. D’Onofrio72, A. D’Orazio131a,131b, M.J. Da Cunha Sargedas De Sousa123a, C. Da Via81, W. Dabrowski37, A. Dafinca117, T. Dai86, C. Dallapiccola83, M. Dam35, M. Dameri49a,49b, D.S. Damiani136, H.O. Danielsson29, V. Dao48, G. Darbo49a, G.L. Darlea25b, J.A. Dassoulas41, W. Davey20, T. Davidek125, N. Davidson85,

R. Davidson70, E. Davies117,c, M. Davies92, O. Davignon77, A.R. Davison76, Y. Davygora57a, E. Dawe141, I. Dawson138_{, R.K. Daya-Ishmukhametova}22_{, K. De}7_{, R. de Asmundis}101a_{, S. De Castro}19a,19b_{, S. De Cecco}77_,

J. de Graat97_{, N. De Groot}103_{, P. de Jong}104_{, C. De La Taille}114_{, H. De la Torre}79_{, F. De Lorenzi}62_{, L. de Mora}70_,

L. De Nooij104_{, D. De Pedis}131a_{, A. De Salvo}131a_{, U. De Sanctis}163a,163c_{, A. De Santo}148_{, J.B. De Vivie De Regie}114_,

G. De Zorzi131a,131b_{, W.J. Dearnaley}70_{, R. Debbe}24_{, C. Debenedetti}45_{, B. Dechenaux}54_{, D.V. Dedovich}63_,

J. Degenhardt119_{, C. Del Papa}163a,163c_{, J. Del Peso}79_{, T. Del Prete}121a,121b_{, T. Delemontex}54_{, M. Deliyergiyev}73_,

A. Dell’Acqua29_{, L. Dell’Asta}21_{, M. Della Pietra}101a,j_{, D. della Volpe}101a,101b_{, M. Delmastro}4_{, P.A. Delsart}54_,

C. Deluca104_{, S. Demers}175_{, M. Demichev}63_{, B. Demirkoz}11,l_{, J. Deng}162_{, S.P. Denisov}127_{, D. Derendarz}38_,

J.E. Derkaoui134d_{, F. Derue}77_{, P. Dervan}72_{, K. Desch}20_{, E. Devetak}147_{, P.O. Deviveiros}104_{, A. Dewhurst}128_,

B. DeWilde147_{, S. Dhaliwal}157_{, R. Dhullipudi}24,m_{, A. Di Ciaccio}132a,132b_{, L. Di Ciaccio}4_{, A. Di Girolamo}29_,

B. Di Girolamo29_{, S. Di Luise}133a,133b_{, A. Di Mattia}172_{, B. Di Micco}29_{, R. Di Nardo}46_{, A. Di Simone}132a,132b_,

R. Di Sipio19a,19b_{, M.A. Diaz}31a_{, E.B. Diehl}86_{, J. Dietrich}41_{, T.A. Dietzsch}57a_{, S. Diglio}85_{, K. Dindar Yagci}39_,

J. Dingfelder20, F. Dinut25a, C. Dionisi131a,131b, P. Dita25a, S. Dita25a, F. Dittus29, F. Djama82, T. Djobava50b, M.A.B. do Vale23c, A. Do Valle Wemans123a,n, T.K.O. Doan4, M. Dobbs84, R. Dobinson29,∗, D. Dobos29, E. Dobson29,o, J. Dodd34, C. Doglioni48, T. Doherty52, Y. Doi64,∗, J. Dolejsi125, I. Dolenc73, Z. Dolezal125, B.A. Dolgoshein95,∗, T. Dohmae154, M. Donadelli23d, J. Donini33, J. Dopke29, A. Doria101a, A. Dos Anjos172, A. Dotti121a,121b_{, M.T. Dova}69_{, A.D. Doxiadis}104_{, A.T. Doyle}52_{, M. Dris}9_{, J. Dubbert}98_{, S. Dube}14_{, E. Duchovni}171_,

G. Duckeck97_{, A. Dudarev}29_{, F. Dudziak}62_{, M. D¨uhrssen}29_{, I.P. Duerdoth}81_{, L. Duflot}114_{, M-A. Dufour}84_,

L. Duguid75_{, M. Dunford}29_{, H. Duran Yildiz}3a_{, R. Duxfield}138_{, M. Dwuznik}37_{, F. Dydak}29_{, M. D¨uren}51_{, J. Ebke}97_,

S. Eckweiler80_{, K. Edmonds}80_{, W. Edson}1_{, C.A. Edwards}75_{, N.C. Edwards}52_{, W. Ehrenfeld}41_{, T. Eifert}142_,

G. Eigen13_{, K. Einsweiler}14_{, E. Eisenhandler}74_{, T. Ekelof}165_{, M. El Kacimi}134c_{, M. Ellert}165_{, S. Elles}4_,

F. Ellinghaus80_{, K. Ellis}74_{, N. Ellis}29_{, J. Elmsheuser}97_{, M. Elsing}29_{, D. Emeliyanov}128_{, R. Engelmann}147_{, A. Engl}97_,

B. Epp60_{, J. Erdmann}53_{, A. Ereditato}16_{, D. Eriksson}145a_{, J. Ernst}1_{, M. Ernst}24_{, J. Ernwein}135_{, D. Errede}164_,

S. Errede164_{, E. Ertel}80_{, M. Escalier}114_{, H. Esch}42_{, C. Escobar}122_{, X. Espinal Curull}11_{, B. Esposito}46_{, F. Etienne}82_,

A.I. Etienvre135_{, E. Etzion}152_{, D. Evangelakou}53_{, H. Evans}59_{, L. Fabbri}19a,19b_{, C. Fabre}29_{, R.M. Fakhrutdinov}127_,

S.M. Farrington , P. Farthouat , P. Fassnacht , D. Fassouliotis , B. Fatholahzadeh , A. Favareto , L. Fayard114, S. Fazio36a,36b, R. Febbraro33, P. Federic143a, O.L. Fedin120, W. Fedorko87, M. Fehling-Kaschek47, L. Feligioni82_{, D. Fellmann}5_{, C. Feng}32d_{, E.J. Feng}5_{, A.B. Fenyuk}127_{, J. Ferencei}143b_{, W. Fernando}5_{, S. Ferrag}52_,

J. Ferrando52_{, V. Ferrara}41_{, A. Ferrari}165_{, P. Ferrari}104_{, R. Ferrari}118a_{, D.E. Ferreira de Lima}52_{, A. Ferrer}166_,

D. Ferrere48_{, C. Ferretti}86_{, A. Ferretto Parodi}49a,49b_{, M. Fiascaris}30_{, F. Fiedler}80_{, A. Filipˇciˇc}73_{, F. Filthaut}103_,

M. Fincke-Keeler168_{, M.C.N. Fiolhais}123a,h_{, L. Fiorini}166_{, A. Firan}39_{, G. Fischer}41_{, M.J. Fisher}108_{, M. Flechl}47_,

I. Fleck140_{, J. Fleckner}80_{, P. Fleischmann}173_{, S. Fleischmann}174_{, T. Flick}174_{, A. Floderus}78_{, L.R. Flores Castillo}172_,

M.J. Flowerdew98_{, T. Fonseca Martin}16_{, A. Formica}135_{, A. Forti}81_{, D. Fortin}158a_{, D. Fournier}114_{, H. Fox}70_,

P. Francavilla11_{, M. Franchini}19a,19b_{, S. Franchino}118a,118b_{, D. Francis}29_{, T. Frank}171_{, S. Franz}29_,

M. Fraternali118a,118b_{, S. Fratina}119_{, S.T. French}27_{, C. Friedrich}41_{, F. Friedrich}43_{, R. Froeschl}29_{, D. Froidevaux}29_,

J.A. Frost27_{, C. Fukunaga}155_{, E. Fullana Torregrosa}29_{, B.G. Fulsom}142_{, J. Fuster}166_{, C. Gabaldon}29_{, O. Gabizon}171_,

T. Gadfort24_{, S. Gadomski}48_{, G. Gagliardi}49a,49b_{, P. Gagnon}59_{, C. Galea}97_{, E.J. Gallas}117_{, V. Gallo}16_,

B.J. Gallop128, P. Gallus124, K.K. Gan108, Y.S. Gao142,e, A. Gaponenko14, F. Garberson175, M. Garcia-Sciveres14, C. Garc´ıa166, J.E. Garc´ıa Navarro166, R.W. Gardner30, N. Garelli29, H. Garitaonandia104, V. Garonne29, C. Gatti46, G. Gaudio118a, B. Gaur140, L. Gauthier135, P. Gauzzi131a,131b, I.L. Gavrilenko93, C. Gay167, G. Gaycken20,

E.N. Gazis9, P. Ge32d, Z. Gecse167, C.N.P. Gee128, D.A.A. Geerts104, Ch. Geich-Gimbel20, K. Gellerstedt145a,145b, C. Gemme49a, A. Gemmell52, M.H. Genest54, S. Gentile131a,131b, M. George53, S. George75, P. Gerlach174, A. Gershon152_{, C. Geweniger}57a_{, H. Ghazlane}134b_{, N. Ghodbane}33_{, B. Giacobbe}19a_{, S. Giagu}131a,131b_,

V. Giakoumopoulou8_{, V. Giangiobbe}11_{, F. Gianotti}29_{, B. Gibbard}24_{, A. Gibson}157_{, S.M. Gibson}29_{, D. Gillberg}28_,

A.R. Gillman128_{, D.M. Gingrich}2,d_{, J. Ginzburg}152_{, N. Giokaris}8_{, M.P. Giordani}163c_{, R. Giordano}101a,101b_,

F.M. Giorgi15_{, P. Giovannini}98_{, P.F. Giraud}135_{, D. Giugni}88a_{, M. Giunta}92_{, P. Giusti}19a_{, B.K. Gjelsten}116_,

L.K. Gladilin96_{, C. Glasman}79_{, J. Glatzer}47_{, A. Glazov}41_{, K.W. Glitza}174_{, G.L. Glonti}63_{, J.R. Goddard}74_,

J. Godfrey141_{, J. Godlewski}29_{, M. Goebel}41_{, T. G¨opfert}43_{, C. Goeringer}80_{, C. G¨ossling}42_{, S. Goldfarb}86_,

T. Golling175_{, A. Gomes}123a,b_{, L.S. Gomez Fajardo}41_{, R. Gon¸calo}75_{, J. Goncalves Pinto Firmino Da Costa}41_,

L. Gonella20_{, S. Gonzalez}172_{, S. Gonz´alez de la Hoz}166_{, G. Gonzalez Parra}11_{, M.L. Gonzalez Silva}26_,

S. Gonzalez-Sevilla48_{, J.J. Goodson}147_{, L. Goossens}29_{, P.A. Gorbounov}94_{, H.A. Gordon}24_{, I. Gorelov}102_,

G. Gorfine174_{, B. Gorini}29_{, E. Gorini}71a,71b_{, A. Goriˇsek}73_{, E. Gornicki}38_{, B. Gosdzik}41_{, A.T. Goshaw}5_,

M. Gosselink104, M.I. Gostkin63, I. Gough Eschrich162, M. Gouighri134a, D. Goujdami134c, M.P. Goulette48, A.G. Goussiou137, C. Goy4, S. Gozpinar22, I. Grabowska-Bold37, P. Grafstr¨om19a,19b, K-J. Grahn41, F. Grancagnolo71a, S. Grancagnolo15, V. Grassi147, V. Gratchev120, N. Grau34, H.M. Gray29, J.A. Gray147, E. Graziani133a, O.G. Grebenyuk120, T. Greenshaw72, Z.D. Greenwood24,m, K. Gregersen35, I.M. Gregor41, P. Grenier142_{, J. Griffiths}7_{, N. Grigalashvili}63_{, A.A. Grillo}136_{, S. Grinstein}11_{, Y.V. Grishkevich}96_{, J.-F. Grivaz}114_,

E. Gross171_{, J. Grosse-Knetter}53_{, J. Groth-Jensen}171_{, K. Grybel}140_{, D. Guest}175_{, C. Guicheney}33_{, S. Guindon}53_,

U. Gul52_{, H. Guler}84,p_{, J. Gunther}124_{, B. Guo}157_{, J. Guo}34_{, P. Gutierrez}110_{, N. Guttman}152_{, O. Gutzwiller}172_,

C. Guyot135_{, C. Gwenlan}117_{, C.B. Gwilliam}72_{, A. Haas}142_{, S. Haas}29_{, C. Haber}14_{, H.K. Hadavand}39_{, D.R. Hadley}17_,

P. Haefner20_{, F. Hahn}29_{, S. Haider}29_{, Z. Hajduk}38_{, H. Hakobyan}176_{, D. Hall}117_{, J. Haller}53_{, K. Hamacher}174_,

P. Hamal112_{, M. Hamer}53_{, A. Hamilton}144b,q_{, S. Hamilton}160_{, L. Han}32b_{, K. Hanagaki}115_{, K. Hanawa}159_,

M. Hance14_{, C. Handel}80_{, P. Hanke}57a_{, J.R. Hansen}35_{, J.B. Hansen}35_{, J.D. Hansen}35_{, P.H. Hansen}35_{, P. Hansson}142_,

K. Hara159_{, G.A. Hare}136_{, T. Harenberg}174_{, S. Harkusha}89_{, D. Harper}86_{, R.D. Harrington}45_{, O.M. Harris}137_,

J. Hartert47_{, F. Hartjes}104_{, T. Haruyama}64_{, A. Harvey}55_{, S. Hasegawa}100_{, Y. Hasegawa}139_{, S. Hassani}135_{, S. Haug}16_,

M. Hauschild29_{, R. Hauser}87_{, M. Havranek}20_{, C.M. Hawkes}17_{, R.J. Hawkings}29_{, A.D. Hawkins}78_{, D. Hawkins}162_,

T. Hayakawa65_{, T. Hayashi}159_{, D. Hayden}75_{, C.P. Hays}117_{, H.S. Hayward}72_{, S.J. Haywood}128_{, M. He}32d_,

S.J. Head17, V. Hedberg78, L. Heelan7, S. Heim87, B. Heinemann14, S. Heisterkamp35, L. Helary21, C. Heller97, M. Heller29, S. Hellman145a,145b, D. Hellmich20, C. Helsens11, R.C.W. Henderson70, M. Henke57a, A. Henrichs53, A.M. Henriques Correia29, S. Henrot-Versille114, C. Hensel53, T. Henß174, C.M. Hernandez7, Y. Hern´andez Jim´enez166, R. Herrberg15, G. Herten47, R. Hertenberger97, L. Hervas29, G.G. Hesketh76, N.P. Hessey104, E. Hig´on-Rodriguez166_{, J.C. Hill}27_{, K.H. Hiller}41_{, S. Hillert}20_{, S.J. Hillier}17_{, I. Hinchliffe}14_{, E. Hines}119_,

M. Hirose115_{, F. Hirsch}42_{, D. Hirschbuehl}174_{, J. Hobbs}147_{, N. Hod}152_{, M.C. Hodgkinson}138_{, P. Hodgson}138_,

A. Hoecker29_{, M.R. Hoeferkamp}102_{, J. Hoffman}39_{, D. Hoffmann}82_{, M. Hohlfeld}80_{, M. Holder}140_{, S.O. Holmgren}145a_,

T. Holy126_{, J.L. Holzbauer}87_{, T.M. Hong}119_{, L. Hooft van Huysduynen}107_{, C. Horn}142_{, S. Horner}47_,

J-Y. Hostachy54_{, S. Hou}150_{, A. Hoummada}134a_{, J. Howard}117_{, J. Howarth}81_{, I. Hristova}15_{, J. Hrivnac}114_,

T. Hryn’ova4_{, P.J. Hsu}80_{, S.-C. Hsu}14_{, Z. Hubacek}126_{, F. Hubaut}82_{, F. Huegging}20_{, A. Huettmann}41_,

T.B. Huffman117_{, E.W. Hughes}34_{, G. Hughes}70_{, M. Huhtinen}29_{, M. Hurwitz}14_{, U. Husemann}41_{, N. Huseynov}63,r_,

J. Huston87_{, J. Huth}56_{, G. Iacobucci}48_{, G. Iakovidis}9_{, M. Ibbotson}81_{, I. Ibragimov}140_{, L. Iconomidou-Fayard}114_,

J. Idarraga114_{, P. Iengo}101a_{, O. Igonkina}104_{, Y. Ikegami}64_{, M. Ikeno}64_{, D. Iliadis}153_{, N. Ilic}157_{, T. Ince}20_,

M. Ishino , M. Ishitsuka , R. Ishmukhametov , C. Issever , S. Istin , A.V. Ivashin , W. Iwanski , H. Iwasaki64, J.M. Izen40, V. Izzo101a, B. Jackson119, J.N. Jackson72, P. Jackson142, M.R. Jaekel29, V. Jain59, K. Jakobs47_{, S. Jakobsen}35_{, T. Jakoubek}124_{, J. Jakubek}126_{, D.K. Jana}110_{, E. Jansen}76_{, H. Jansen}29_{, A. Jantsch}98_,

M. Janus47_{, G. Jarlskog}78_{, L. Jeanty}56_{, I. Jen-La Plante}30_{, D. Jennens}85_{, P. Jenni}29_{, P. Jeˇz}35_{, S. J´ez´equel}4_,

M.K. Jha19a_{, H. Ji}172_{, W. Ji}80_{, J. Jia}147_{, Y. Jiang}32b_{, M. Jimenez Belenguer}41_{, S. Jin}32a_{, O. Jinnouchi}156_,

M.D. Joergensen35_{, D. Joffe}39_{, M. Johansen}145a,145b_{, K.E. Johansson}145a_{, P. Johansson}138_{, S. Johnert}41_,

K.A. Johns6_{, K. Jon-And}145a,145b_{, G. Jones}169_{, R.W.L. Jones}70_{, T.J. Jones}72_{, C. Joram}29_{, P.M. Jorge}123a_,

K.D. Joshi81_{, J. Jovicevic}146_{, T. Jovin}12b_{, X. Ju}172_{, C.A. Jung}42_{, R.M. Jungst}29_{, V. Juranek}124_{, P. Jussel}60_,

A. Juste Rozas11_{, S. Kabana}16_{, M. Kaci}166_{, A. Kaczmarska}38_{, P. Kadlecik}35_{, M. Kado}114_{, H. Kagan}108_{, M. Kagan}56_,

E. Kajomovitz151_{, S. Kalinin}174_{, L.V. Kalinovskaya}63_{, S. Kama}39_{, N. Kanaya}154_{, M. Kaneda}29_{, S. Kaneti}27_,

T. Kanno156_{, V.A. Kantserov}95_{, J. Kanzaki}64_{, B. Kaplan}175_{, A. Kapliy}30_{, J. Kaplon}29_{, D. Kar}52_{, M. Karagounis}20_,

K. Karakostas9_{, M. Karnevskiy}41_{, V. Kartvelishvili}70_{, A.N. Karyukhin}127_{, L. Kashif}172_{, G. Kasieczka}57b_,

R.D. Kass108, A. Kastanas13, M. Kataoka4, Y. Kataoka154, E. Katsoufis9, J. Katzy41, V. Kaushik6, K. Kawagoe68, T. Kawamoto154, G. Kawamura80, M.S. Kayl104, S. Kazama154, V.A. Kazanin106, M.Y. Kazarinov63, R. Keeler168, R. Kehoe39, M. Keil53, G.D. Kekelidze63, J.S. Keller137, M. Kenyon52, O. Kepka124, N. Kerschen29, B.P. Kerˇsevan73, S. Kersten174, K. Kessoku154, J. Keung157, F. Khalil-zada10, H. Khandanyan164, A. Khanov111, D. Kharchenko63, A. Khodinov95, A. Khomich57a, T.J. Khoo27, G. Khoriauli20, A. Khoroshilov174, V. Khovanskiy94, E. Khramov63, J. Khubua50b_{, H. Kim}145a,145b_{, S.H. Kim}159_{, N. Kimura}170_{, O. Kind}15_{, B.T. King}72_{, M. King}65_{, R.S.B. King}117_,

J. Kirk128_{, A.E. Kiryunin}98_{, T. Kishimoto}65_{, D. Kisielewska}37_{, T. Kitamura}65_{, T. Kittelmann}122_{, E. Kladiva}143b_,

M. Klein72_{, U. Klein}72_{, K. Kleinknecht}80_{, M. Klemetti}84_{, A. Klier}171_{, P. Klimek}145a,145b_{, A. Klimentov}24_,

R. Klingenberg42_{, J.A. Klinger}81_{, E.B. Klinkby}35_{, T. Klioutchnikova}29_{, P.F. Klok}103_{, S. Klous}104_{, E.-E. Kluge}57a_,

T. Kluge72_{, P. Kluit}104_{, S. Kluth}98_{, N.S. Knecht}157_{, E. Kneringer}60_{, E.B.F.G. Knoops}82_{, A. Knue}53_{, B.R. Ko}44_,

T. Kobayashi154_{, M. Kobel}43_{, M. Kocian}142_{, P. Kodys}125_{, K. K¨oneke}29_{, A.C. K¨onig}103_{, S. Koenig}80_{, L. K¨opke}80_,

F. Koetsveld103_{, P. Koevesarki}20_{, T. Koffas}28_{, E. Koffeman}104_{, L.A. Kogan}117_{, S. Kohlmann}174_{, F. Kohn}53_,

Z. Kohout126_{, T. Kohriki}64_{, T. Koi}142_{, G.M. Kolachev}106,∗_{, H. Kolanoski}15_{, V. Kolesnikov}63_{, I. Koletsou}88a_,

J. Koll87_{, M. Kollefrath}47_{, A.A. Komar}93_{, Y. Komori}154_{, T. Kondo}64_{, T. Kono}41,s_{, A.I. Kononov}47_,

R. Konoplich107,t_{, N. Konstantinidis}76_{, S. Koperny}37_{, K. Korcyl}38_{, K. Kordas}153_{, A. Korn}117_{, A. Korol}106_,

I. Korolkov11, E.V. Korolkova138, V.A. Korotkov127, O. Kortner98, S. Kortner98, V.V. Kostyukhin20, S. Kotov98, V.M. Kotov63, A. Kotwal44, C. Kourkoumelis8, V. Kouskoura153, A. Koutsman158a, R. Kowalewski168,

T.Z. Kowalski37, W. Kozanecki135, A.S. Kozhin127, V. Kral126, V.A. Kramarenko96, G. Kramberger73,

M.W. Krasny77, A. Krasznahorkay107, J.K. Kraus20, S. Kreiss107, F. Krejci126, J. Kretzschmar72, N. Krieger53, P. Krieger157_{, K. Kroeninger}53_{, H. Kroha}98_{, J. Kroll}119_{, J. Kroseberg}20_{, J. Krstic}12a_{, U. Kruchonak}63_{, H. Kr¨uger}20_,

T. Kruker16_{, N. Krumnack}62_{, Z.V. Krumshteyn}63_{, T. Kubota}85_{, S. Kuday}3a_{, S. Kuehn}47_{, A. Kugel}57c_{, T. Kuhl}41_,

D. Kuhn60_{, V. Kukhtin}63_{, Y. Kulchitsky}89_{, S. Kuleshov}31b_{, C. Kummer}97_{, M. Kuna}77_{, J. Kunkle}119_{, A. Kupco}124_,

H. Kurashige65_{, M. Kurata}159_{, Y.A. Kurochkin}89_{, V. Kus}124_{, E.S. Kuwertz}146_{, M. Kuze}156_{, J. Kvita}141_{, R. Kwee}15_,

A. La Rosa48_{, L. La Rotonda}36a,36b_{, L. Labarga}79_{, J. Labbe}4_{, S. Lablak}134a_{, C. Lacasta}166_{, F. Lacava}131a,131b_,

H. Lacker15_{, D. Lacour}77_{, V.R. Lacuesta}166_{, E. Ladygin}63_{, R. Lafaye}4_{, B. Laforge}77_{, T. Lagouri}79_{, S. Lai}47_,

E. Laisne54_{, M. Lamanna}29_{, L. Lambourne}76_{, C.L. Lampen}6_{, W. Lampl}6_{, E. Lancon}135_{, U. Landgraf}47_,

M.P.J. Landon74_{, J.L. Lane}81_{, V.S. Lang}57a_{, C. Lange}41_{, A.J. Lankford}162_{, F. Lanni}24_{, K. Lantzsch}174_{, S. Laplace}77_,

C. Lapoire20_{, J.F. Laporte}135_{, T. Lari}88a_{, A. Larner}117_{, M. Lassnig}29_{, P. Laurelli}46_{, V. Lavorini}36a,36b_,

W. Lavrijsen14_{, P. Laycock}72_{, O. Le Dortz}77_{, E. Le Guirriec}82_{, C. Le Maner}157_{, E. Le Menedeu}11_{, T. LeCompte}5_,

F. Ledroit-Guillon54_{, H. Lee}104_{, J.S.H. Lee}115_{, S.C. Lee}150_{, L. Lee}175_{, M. Lefebvre}168_{, M. Legendre}135_{, F. Legger}97_,

C. Leggett14, M. Lehmacher20, G. Lehmann Miotto29, X. Lei6, M.A.L. Leite23d, R. Leitner125, D. Lellouch171, B. Lemmer53, V. Lendermann57a, K.J.C. Leney144b, T. Lenz104, G. Lenzen174, B. Lenzi29, K. Leonhardt43, S. Leontsinis9, F. Lepold57a, C. Leroy92, J-R. Lessard168, C.G. Lester27, C.M. Lester119, J. Levˆeque4, D. Levin86, L.J. Levinson171, A. Lewis117, G.H. Lewis107, A.M. Leyko20, M. Leyton15, B. Li82, H. Li172,u, S. Li32b,v, X. Li86, Z. Liang117,w_{, H. Liao}33_{, B. Liberti}132a_{, P. Lichard}29_{, M. Lichtnecker}97_{, K. Lie}164_{, W. Liebig}13_{, C. Limbach}20_,

A. Limosani85_{, M. Limper}61_{, S.C. Lin}150,x_{, F. Linde}104_{, J.T. Linnemann}87_{, E. Lipeles}119_{, A. Lipniacka}13_,

T.M. Liss164_{, D. Lissauer}24_{, A. Lister}48_{, A.M. Litke}136_{, C. Liu}28_{, D. Liu}150_{, H. Liu}86_{, J.B. Liu}86_{, L. Liu}86_,

M. Liu32b_{, Y. Liu}32b_{, M. Livan}118a,118b_{, S.S.A. Livermore}117_{, A. Lleres}54_{, J. Llorente Merino}79_{, S.L. Lloyd}74_,

E. Lobodzinska41_{, P. Loch}6_{, W.S. Lockman}136_{, T. Loddenkoetter}20_{, F.K. Loebinger}81_{, A. Loginov}175_{, C.W. Loh}167_,

T. Lohse15_{, K. Lohwasser}47_{, M. Lokajicek}124_{, V.P. Lombardo}4_{, R.E. Long}70_{, L. Lopes}123a_{, D. Lopez Mateos}56_,

J. Lorenz97_{, N. Lorenzo Martinez}114_{, M. Losada}161_{, P. Loscutoff}14_{, F. Lo Sterzo}131a,131b_{, M.J. Losty}158a_{, X. Lou}40_,

A. Lounis114_{, K.F. Loureiro}161_{, J. Love}21_{, P.A. Love}70_{, A.J. Lowe}142,e_{, F. Lu}32a_{, H.J. Lubatti}137_{, C. Luci}131a,131b_,

A. Lucotte54_{, A. Ludwig}43_{, D. Ludwig}41_{, I. Ludwig}47_{, J. Ludwig}47_{, F. Luehring}59_{, G. Luijckx}104_{, W. Lukas}60_,

O. Lundberg , J. Lundquist , M. Lungwitz , D. Lynn , E. Lytken , H. Ma , L.L. Ma , G. Maccarrone46, A. Macchiolo98, B. Maˇcek73, J. Machado Miguens123a, R. Mackeprang35, R.J. Madaras14, H.J. Maddocks70_{, W.F. Mader}43_{, R. Maenner}57c_{, T. Maeno}24_{, P. M¨attig}174_{, S. M¨attig}41_{, L. Magnoni}29_,

E. Magradze53_{, K. Mahboubi}47_{, S. Mahmoud}72_{, G. Mahout}17_{, C. Maiani}135_{, C. Maidantchik}23a_{, A. Maio}123a,b_,

S. Majewski24_{, Y. Makida}64_{, N. Makovec}114_{, P. Mal}135_{, B. Malaescu}29_{, Pa. Malecki}38_{, P. Malecki}38_{, V.P. Maleev}120_,

F. Malek54_{, U. Mallik}61_{, D. Malon}5_{, C. Malone}142_{, S. Maltezos}9_{, V. Malyshev}106_{, S. Malyukov}29_{, R. Mameghani}97_,

J. Mamuzic12b_{, A. Manabe}64_{, L. Mandelli}88a_{, I. Mandi´c}73_{, R. Mandrysch}15_{, J. Maneira}123a_{, P.S. Mangeard}87_,

L. Manhaes de Andrade Filho23b_{, J.A. Manjarres Ramos}135_{, A. Mann}53_{, P.M. Manning}136_,

A. Manousakis-Katsikakis8_{, B. Mansoulie}135_{, A. Mapelli}29_{, L. Mapelli}29_{, L. March}79_{, J.F. Marchand}28_,

F. Marchese132a,132b_{, G. Marchiori}77_{, M. Marcisovsky}124_{, C.P. Marino}168_{, F. Marroquim}23a_{, Z. Marshall}29_,

F.K. Martens157_{, L.F. Marti}16_{, S. Marti-Garcia}166_{, B. Martin}29_{, B. Martin}87_{, J.P. Martin}92_{, T.A. Martin}17_,

V.J. Martin45_{, B. Martin dit Latour}48_{, S. Martin-Haugh}148_{, M. Martinez}11_{, V. Martinez Outschoorn}56_,

A.C. Martyniuk168, M. Marx81, F. Marzano131a, A. Marzin110, L. Masetti80, T. Mashimo154, R. Mashinistov93, J. Masik81, A.L. Maslennikov106, I. Massa19a,19b, G. Massaro104, N. Massol4, P. Mastrandrea147,

A. Mastroberardino36a,36b, T. Masubuchi154, P. Matricon114, H. Matsunaga154, T. Matsushita65, C. Mattravers117,c, J. Maurer82, S.J. Maxfield72, A. Mayne138, R. Mazini150, M. Mazur20, L. Mazzaferro132a,132b, M. Mazzanti88a, S.P. Mc Kee86_{, A. McCarn}164_{, R.L. McCarthy}147_{, T.G. McCarthy}28_{, N.A. McCubbin}128_{, K.W. McFarlane}55,∗_,

J.A. Mcfayden138_{, G. Mchedlidze}50b_{, T. Mclaughlan}17_{, S.J. McMahon}128_{, R.A. McPherson}168,k_{, A. Meade}83_,

J. Mechnich104_{, M. Mechtel}174_{, M. Medinnis}41_{, R. Meera-Lebbai}110_{, T. Meguro}115_{, R. Mehdiyev}92_{, S. Mehlhase}35_,

A. Mehta72_{, K. Meier}57a_{, B. Meirose}78_{, C. Melachrinos}30_{, B.R. Mellado Garcia}172_{, F. Meloni}88a,88b_,

L. Mendoza Navas161_{, Z. Meng}150,u_{, A. Mengarelli}19a,19b_{, S. Menke}98_{, E. Meoni}160_{, K.M. Mercurio}56_{, P. Mermod}48_,

L. Merola101a,101b_{, C. Meroni}88a_{, F.S. Merritt}30_{, H. Merritt}108_{, A. Messina}29,y_{, J. Metcalfe}24_{, A.S. Mete}162_,

C. Meyer80_{, C. Meyer}30_{, J-P. Meyer}135_{, J. Meyer}173_{, J. Meyer}53_{, T.C. Meyer}29_{, J. Miao}32d_{, S. Michal}29_{, L. Micu}25a_,

R.P. Middleton128_{, S. Migas}72_{, L. Mijovi´c}135_{, G. Mikenberg}171_{, M. Mikestikova}124_{, M. Mikuˇz}73_{, D.W. Miller}30_,

R.J. Miller87_{, W.J. Mills}167_{, C. Mills}56_{, A. Milov}171_{, D.A. Milstead}145a,145b_{, D. Milstein}171_{, A.A. Minaenko}127_,

M. Mi˜nano Moya166_{, I.A. Minashvili}63_{, A.I. Mincer}107_{, B. Mindur}37_{, M. Mineev}63_{, Y. Ming}172_{, L.M. Mir}11_,

G. Mirabelli131a_{, J. Mitrevski}136_{, V.A. Mitsou}166_{, S. Mitsui}64_{, P.S. Miyagawa}138_{, J.U. Mj¨ornmark}78_{, T. Moa}145a,145b_,

V. Moeller27, K. M¨onig41, N. M¨oser20, S. Mohapatra147, W. Mohr47, R. Moles-Valls166, J. Monk76, E. Monnier82, J. Montejo Berlingen11, F. Monticelli69, S. Monzani19a,19b, R.W. Moore2, G.F. Moorhead85, C. Mora Herrera48, A. Moraes52, N. Morange135, J. Morel53, G. Morello36a,36b, D. Moreno80, M. Moreno Ll´acer166, P. Morettini49a, M. Morgenstern43, M. Morii56, A.K. Morley29, G. Mornacchi29, J.D. Morris74, L. Morvaj100, H.G. Moser98, M. Mosidze50b_{, J. Moss}108_{, R. Mount}142_{, E. Mountricha}9,z_{, S.V. Mouraviev}93,∗_{, E.J.W. Moyse}83_{, F. Mueller}57a_,

J. Mueller122_{, K. Mueller}20_{, T.A. M¨uller}97_{, T. Mueller}80_{, D. Muenstermann}29_{, Y. Munwes}152_{, W.J. Murray}128_,

I. Mussche104_{, E. Musto}101a,101b_{, A.G. Myagkov}127_{, M. Myska}124_{, J. Nadal}11_{, K. Nagai}159_{, R. Nagai}156_,

K. Nagano64_{, A. Nagarkar}108_{, Y. Nagasaka}58_{, M. Nagel}98_{, A.M. Nairz}29_{, Y. Nakahama}29_{, K. Nakamura}154_,

T. Nakamura154_{, I. Nakano}109_{, G. Nanava}20_{, A. Napier}160_{, R. Narayan}57b_{, M. Nash}76,c_{, T. Nattermann}20_,

T. Naumann41_{, G. Navarro}161_{, H.A. Neal}86_{, P.Yu. Nechaeva}93_{, T.J. Neep}81_{, A. Negri}118a,118b_{, G. Negri}29_,

M. Negrini19a_{, S. Nektarijevic}48_{, A. Nelson}162_{, T.K. Nelson}142_{, S. Nemecek}124_{, P. Nemethy}107_{, A.A. Nepomuceno}23a_,

M. Nessi29,aa_{, M.S. Neubauer}164_{, M. Neumann}174_{, A. Neusiedl}80_{, R.M. Neves}107_{, P. Nevski}24_{, P.R. Newman}17_,

V. Nguyen Thi Hong135_{, R.B. Nickerson}117_{, R. Nicolaidou}135_{, B. Nicquevert}29_{, F. Niedercorn}114_{, J. Nielsen}136_,

N. Nikiforou34_{, A. Nikiforov}15_{, V. Nikolaenko}127_{, I. Nikolic-Audit}77_{, K. Nikolics}48_{, K. Nikolopoulos}17_{, H. Nilsen}47_,

P. Nilsson7_{, Y. Ninomiya}154_{, A. Nisati}131a_{, R. Nisius}98_{, T. Nobe}156_{, L. Nodulman}5_{, M. Nomachi}115_{, I. Nomidis}153_,

S. Norberg110, M. Nordberg29, P.R. Norton128, J. Novakova125, M. Nozaki64, L. Nozka112, I.M. Nugent158a, A.-E. Nuncio-Quiroz20, G. Nunes Hanninger85, T. Nunnemann97, E. Nurse76, B.J. O’Brien45, S.W. O’Neale17,∗, D.C. O’Neil141, V. O’Shea52, L.B. Oakes97, F.G. Oakham28,d, H. Oberlack98, J. Ocariz77, A. Ochi65, S. Oda68, S. Odaka64, J. Odier82, H. Ogren59, A. Oh81, S.H. Oh44, C.C. Ohm29, T. Ohshima100, H. Okawa24, Y. Okumura30, T. Okuyama154_{, A. Olariu}25a_{, A.G. Olchevski}63_{, S.A. Olivares Pino}31a_{, M. Oliveira}123a,h_{, D. Oliveira Damazio}24_,

E. Oliver Garcia166_{, D. Olivito}119_{, A. Olszewski}38_{, J. Olszowska}38_{, A. Onofre}123a,ab_{, P.U.E. Onyisi}30_{, C.J. Oram}158a_,

M.J. Oreglia30_{, Y. Oren}152_{, D. Orestano}133a,133b_{, N. Orlando}71a,71b_{, I. Orlov}106_{, C. Oropeza Barrera}52_{, R.S. Orr}157_,

B. Osculati49a,49b_{, R. Ospanov}119_{, C. Osuna}11_{, G. Otero y Garzon}26_{, J.P. Ottersbach}104_{, M. Ouchrif}134d_,

E.A. Ouellette168_{, F. Ould-Saada}116_{, A. Ouraou}135_{, Q. Ouyang}32a_{, A. Ovcharova}14_{, M. Owen}81_{, S. Owen}138_,

V.E. Ozcan18a_{, N. Ozturk}7_{, A. Pacheco Pages}11_{, C. Padilla Aranda}11_{, S. Pagan Griso}14_{, E. Paganis}138_{, C. Pahl}98_,

F. Paige24_{, P. Pais}83_{, K. Pajchel}116_{, G. Palacino}158b_{, C.P. Paleari}6_{, S. Palestini}29_{, D. Pallin}33_{, A. Palma}123a_,

J.D. Palmer17_{, Y.B. Pan}172_{, E. Panagiotopoulou}9_{, P. Pani}104_{, N. Panikashvili}86_{, S. Panitkin}24_{, D. Pantea}25a_,

A. Papadelis145a_{, Th.D. Papadopoulou}9_{, A. Paramonov}5_{, D. Paredes Hernandez}33_{, W. Park}24,ac_{, M.A. Parker}27_,