Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs

(1)

Study of the Mass and Spin-Parity of the Higgs Boson Candidate via Its Decays to Z Boson Pairs

S. Chatrchyan et al.*

(CMS Collaboration)

(Received 29 December 2012; published 21 February 2013)

A study is presented of the mass and spin-parity of the new boson recently observed at the LHC at a mass near 125 GeV. An integrated luminosity of 17:3 fb¹, collected by the CMS experiment in proton- proton collisions at center-of-mass energies of 7 and 8 TeV, is used. The measured mass in theZZ channel, where bothZ bosons decay to e or pairs, is 126:2 0:6ðstatÞ 0:2ðsystÞ GeV. The angular distributions of the lepton pairs in this channel are sensitive to the spin-parity of the boson. Under the assumption of spin 0, the present data are consistent with the pure scalar hypothesis, while disfavoring the pure pseudoscalar hypothesis.

DOI:10.1103/PhysRevLett.110.081803 PACS numbers: 14.80.Bn, 12.60.i, 13.85.Qk, 13.88.+e

Recently the ATLAS and CMS Collaborations announced the observation of a narrow resonance with mass near 125 GeV [1,2] and properties consistent with those of the Higgs boson predicted in the standard model (SM) [3–5] of particle physics. This observation may help to elucidate the nature of spontaneous electroweak symmetry breaking [6–11]. The main decay modes by which this resonance is observed include photon pairs () and massive vector boson pairs (WW and ZZ), where at least one of the vector bosons is off mass shell. As more proton-proton collision data are recorded at the Large Hadron Collider (LHC), attention is turning to the deter- mination of various properties of this state, including its mass, spin, parity, and couplings to SM particles.

The observation of the new boson in the channel implies that the resonance must be a boson with spin 0 or 2;

spin 1 is excluded by the Landau-Yang theorem [12,13].

The decays of the new boson toZZ in which both Z bosons decay to charged-lepton pairs (‘^þ‘, where‘ ¼ e or ) offer the possibility to probe the spin-parity and mass of the resonance. We describe these measurements in this Letter, using a data set recorded by the CMS experiment in proton-proton collisions at the LHC, corresponding to an integrated luminosity of 17:3 fb¹, with 5:1 fb¹ collected at a center-of-mass energy of 7 TeV and 12:2 fb¹at 8 TeV.

The compact muon solenoid (CMS) detector, described in detail elsewhere [14], is a large general-purpose device based on a silicon pixel and strip tracking system, a lead tungstate crystal electromagnetic calorimeter (ECAL), and a brass and scintillator hadron calorimeter, all inside the field volume of a 3.8 T solenoidal magnet. Outside the

magnet is a multilayered muon detection system embedded in steel absorber plates, which form the return path for the magnetic flux, as well as forward calorimetry. The detector is particularly well suited for measuring electron and muon transverse momenta (p_T) over a wide range.

The signal candidates are selected using well-identified and isolated prompt leptons. The event selection and lepton reconstruction are described elsewhere [2]. Events are selected online by triggers requiring the presence of either anee, e, or pair with asymmetric p_T thresholds, or three electrons with reduced thresholds. The reconstructed electrons are required to havep^e_T> 7 GeV and to be within the tracker geometrical acceptance, at pseudorapidities j^ej < 2:5, where ln½tanð=2Þ in terms of the polar angle. The corresponding requirements for reconstructed muons are p_T > 5 GeV and jj < 2:4. The selection requires the presence of two pairs of leptons. The leptons in a pair must be of opposite charge and same flavor.

Photons withp_T> 2 GeV are reconstructed within jj <

2:4 and considered as possible final-state radiation (FSR) candidates. An FSR photon is retained and associated with the closest lepton in a lepton pair only if the dilepton plus photon mass is closer to the nominal Z boson mass. One lepton pair is required to be loosely consistent with orig- inating from a Z decay by demanding that the invariant mass of the pair be in the range 40–120 GeV. The first pair, denotedZ1, is the one nearest theZ in mass. The second pair, denoted Z2, is required to satisfy 12< mZ2<

120 GeV. Among the four selected leptons forming the two Z boson candidates, at least one should have p_T>

20 GeV and another should have p_T> 10 GeV.

The selected sample is dominated by continuum electroweak production ofZZ=Z, which constitutes irreduc- ible background, estimated from Monte Carlo simulation as in the previous analysis [2]. A small background from reducible sources remains, mainly from Z þ X events, where X consists of two reconstructed leptons, at least one of which is a nonprompt lepton, including misidenti- fied leptons, leptons from heavy-quark decays, or photon

*Full author list given at the end of the article.

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

(2)

conversions. The reducible background is measured from signal-free control regions in experimental data [2].

The performance of the signal selection and background suppression has been improved compared with the previous analysis [2] by using a three-electron trigger, using better muon reconstruction and momentum measurement algorithms, fine-tuning the electron isolation requirement, and by using a regression technique, as previously used for theH ! analysis [2], for the contribution of the ECAL to the electron momentum measurement. For similar reducible background rates, the absolute signal detection efficiency is improved by up to 4% in the 4e channel and up to 2% in the 2e2 channel. The resolution of the reconstructed mass of the 4‘ system is improved, relatively, by about 10% in the 4e and 2e2 channels. Signal candidate masses are measured with a per-event mass precision varying between 1% and 3%. The detection efficiency for a SM Higgs boson of m ¼ 126 GeV, with leptons within the geometrical acceptance, is 31% in the 4e channel, 42% in the 2e2 channel, and 59% in the 4

channel.

Systematic uncertainties are evaluated from the observed data for the trigger efficiency (1.5%) and the combined lepton reconstruction, identification, and isolation efficiencies. These range from 1.2% in the 4 channel to about 11% in the 4e channel. Systematic uncertainties on energy-momentum calibration and energy resolution are incorporated through their effects on the reconstructed mass distributions. Uncertainties of 0.2%, 0.2%, and 0.1%, are assigned on the mass scale for the 4e, 2e2, and 4

channels, respectively. The effect of the energy resolution uncertainties is taken into account by incorporating a 20%

uncertainty on the simulated width of the signal mass peak. To validate the level of accuracy with which the absolute mass scale and resolution are known [2,15], we use Z ! ‘‘, ! ‘‘, and J=c ! ‘‘ events. The limited statistical precision of the control samples is included as a systematic uncertainty on the final results.

Since the reducible background is derived from control regions, its prediction is independent of the uncertainties on the integrated luminosity. The integrated luminosity uncertainty (2.2% at 7 TeV [16] and 4.4% at 8 TeV [17]) enters the evaluation of the expectedZZ background and signal rates. Systematic uncertainties on the Higgs boson cross section (about 18%) and branching fraction (2%) are taken from Refs. [18,19].

Figure1(a)shows the invariant mass distribution of the selected four-lepton events in the mass range 70< m_4‘<

180 GeV. The contribution expected from a SM Higgs boson of mass m ¼ 126 GeV is displayed. The peak from Z ! 4‘ decay, studied in detail elsewhere [20], is observed at the nominalZ boson mass. The signal from the new boson is a distinct peak above the expected background, consistent with the signal line shape depicted in the figure. The background is locally flat and dominated by

the ZZ=Z contribution. In the mass range, 121:5 <

m_4‘< 130:5 GeV, corresponding to the three central bins around the new boson peak in Fig. 1(a), we observe 17 events: there are 6, 8, and 3 events in the 4, 2e2, and 4e final states, respectively. This compares to an expectation of 6:8 0:8ðstatÞ 0:3ðsystÞ from SM background.

Further separation between the signal and background is provided by a discriminant K_D that incorporates the

(GeV) m4

80 100 120 140 160 180

Events / 3 GeV

0 5 10 15 20 25 30

Observed Z+X

*, ZZ Z

=126 GeV mH

CMS s = 7 (8) TeV, L = 5.1 (12.2) fb^-1 (a)

(GeV) m4

Events / 3 GeV

0 1 2 3 4 5 6 7 8

120 140 160 180 KD > 0.5

(GeV) mH

123 124 125 126 127 128 129

0 1 2 3 4 5 6 7 8 9 10

with syst.

no syst.

CMS s = 7 (8) TeV, L = 5.1 (12.2) fb^-1 (b) ZZ

H

FIG. 1 (color online). (a) Distribution of four-lepton invariant mass in the range near the 126 GeV resonance. Points represent the observed data, shaded histograms represent the backgrounds, and the open histograms represent the signal expectation. The inset shows the m_4‘ distribution for events with high values of kinematic discriminant K_D. (b) Scan of 2 lnL versus m_H with and without the effect of systematic uncertainties included.

(3)

production and decay kinematics. In this analysis, we make use of observables defined for each event in the 4‘ center- of-mass frame; the rapidity and transverse momentum of the 4‘ system depend on the production mechanism and are ignored. We use a matrix element likelihood approach [2,21–23], which combines, for each value ofm_4‘, the two dilepton masses mZ1 and mZ2 and five angular variables denoted ~. We introduce a kinematic discriminant K_D using the probability density in the dilepton masses and angular variables,P ðm_Z₁; m_Z₂; ~jm_4‘Þ. The discriminant is defined as

K_D Psig

PsigþPbkg¼

1þPbkgðmZ1;mZ2; ~jm4‘Þ PsigðmZ1;mZ2; ~jm4‘Þ

₁ : (1)

A scalar SM Higgs boson is assumed for the signal. The separation between the signal and background is relatively insensitive to the particular choice of a signal spin-parity hypothesis [22]. The minimump value [24], which char- acterizes the probability for a background fluctuation to be at least as large as the observed maximum excess around m ’ 126 GeV, is obtained from the measurements of m_4‘

and K_D. It corresponds to a significance of 4.5 standard deviations, which is to be compared to an expected significance of 5.0 standard deviations for the SM Higgs boson.

We measure the mass of the boson using a maximum- likelihood fit to three-dimensional distributions combining for each event them4‘, the associated per-event uncertainties m4‘ [15] calculated from the individual lepton momentum errors, andK_D. The signal strength (defined below) is a free parameter in this mass fit. A scalar SM Higgs boson is assumed for the signal line shape.

Figure1(b) shows the value of2 lnL, where L is the likelihood, as a function ofm_H, with and without the effects of systematic uncertainties included. An estimate for the mass of 126:2 0:6ðstatÞ 0:2ðsystÞ GeV is obtained.

Combined with the result from the channel [2], we obtain a mass of 125:8 0:4ðstatÞ 0:4ðsystÞ GeV. This value improves upon and supersedes the previous result.

We then compare the observations with the expectation for the SM Higgs boson at the mass value fixed to 125.8 GeV, and obtain a measurement of the signal strength

¼ =SM, the production cross section times the branching fraction relative to the SM expectation. This is evaluated from a scan of a profile likelihood ratio. We perform an unbinned maximum-likelihood fit of the two- dimensional distributions P ðm4‘jmHÞ P ðKDjm4‘Þ for the signal, andP ðm_4‘Þ P ðK_Djm_4‘Þ for the background.

The fit is performed simultaneously in the 4e, 2e2, and 4 channels. We obtain a signal strength of ¼ 0:80^þ0:35_0:28, consistent with the expectation for a SM Higgs boson.

The kinematics of the production and decay of the new boson in theZZ ! 4‘ channel are sensitive to its spin and parity [21–23,25–35]. To distinguish any two spin-parity hypotheses, we use discriminants of the form D12¼ P1=ðP1þ P2Þ, where P1 andP2 are the probability densities in m_Z₁, m_Z₂, and ~ corresponding to the two spin-parity hypotheses we wish to discriminate and include parametrizations of them_4‘distribution for a resonance at the mass of the new boson. We define two spin- parity discriminants:DPSfor the discrimination between a SM Higgs boson and a pure pseudoscalar state J^P¼ 0; DGSfor discrimination between a SM Higgs boson and a spin-two tensor stateJ^P¼ 2^þ with the minimal graviton- like coupling to gluons in production and to Z bosons in decay. We also define a discriminantDSB ¼ Psig=ðPsigþ PbkgÞ, similar to KD but where the probability densities also include m4‘, for the discrimination between a SM Higgs boson, withJ^P¼ 0^þ, and the background.

We then fit the observed data in a two-dimensional plane ofDPSorDGSversusDSB in the mass range 106< m4‘<

141 GeV and obtain the likelihood values L1 andL2 for

*, ZZ Z

=126 GeV , mH

0+

DSB

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events / 0.03

0 2 4 6 8 10 12

CMS

(a) Observed

Z+X

*, ZZ Z

=126 GeV , mH

0+

=126 GeV , mH

0-

DPS

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events / 0.03

0 1 2 3 4 5 6CMS

(b)

> 0.5 DSB

DGS

*, ZZ Z

=126 GeV , mH

0+

=126 GeV , mH

2+

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Events / 0.03

0 1 2 3 4 5 6

CMS s = 7 (8) TeV, L = 5.1 (12.2) fb^-1 s = 7 (8) TeV, L = 5.1 (12.2) fb^-1

s = 7 (8) TeV, L = 5.1 (12.2) fb^-1

(c)

> 0.5 DSB

FIG. 2 (color online). (a) Observed distribution of theDSB(SM Higgs boson versus background) discriminant compared with the background and signal expectations. (b) Observed distribution of DPS (J^P¼ 0 versus J^P¼ 0^þ) compared with expectation, for DSB> 0:5. (c) Observed distribution of DGS(J^P¼ 2^þversusJ^P¼ 0^þ) compared with expectation, forDSB> 0:5. Points represent the observed data, shaded histograms represent the background, and the open histograms represent the expectation for a 126 GeV boson with the indicated spin-parity, produced at the SM Higgs boson rate.

(4)

two hypotheses of each signal type plus background.

Figure 2(a) shows the observed projections of DSB for events in this mass range, and for a SM Higgs boson signal with m ¼ 126 GeV. Figures 2(b) and 2(c) show the projections of the DPS and DGS discriminants, for events withDSB> 0:5. In these latter two cases, the distributions for the spin-parity states being distinguished are also illus- trated in the plot. More data are needed for significant discrimination of the 0^þfrom the 2^þhypothesis.

Figure 3 shows the distributions of the log-likelihood ratio 2 lnL0=L0^þ from pseudoexperiments under the assumptions of either a pure scalar or a pure pseudoscalar model. The arrow indicates the observed value. Under the assumption of spin 0, the test statistic formed from a profile likelihood ratio ¼ L0=L0^þ of the 0 and 0^þ hypotheses yields ap value of 0.072% for 0and ap value of 0.7 for 0^þ, with2 ln ¼ 5:5 favoring 0^þ. This corresponds to a CL_s[36] value of 2.4%, a more conservative value for judging whether the observed data are compatible with 0. The results presented here have been confirmed with independent methods [37] based on leading-order matrix elements [38].

In summary, we have measured the mass of the new boson to be 126:2 0:6ðstatÞ 0:2ðsystÞ GeV in the ZZ channel, where both Z bosons decay to lepton pairs. Combining results from the and ZZ channels, we obtain a mass of 125:8 0:4ðstatÞ 0:4ðsystÞ GeV, which improves upon previously published results. At this mass the signal strength

¼ =SM is measured to be ¼ 0:80^þ0:35_0:28. Under the assumption of spin zero, the observed data are consistent with the pure scalar hypothesis, while disfavoring the pure

pseudoscalar hypothesis. This is the first study of the spin- parity of the newly discovered boson.

We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid for delivering so effec- tively the computing infrastructure essential to our analy- ses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies:

BMWF and FWF (Austria); FNRS and FWO (Belgium);

CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MEYS (Bulgaria); CERN; CAS, MoST, and NSFC (China);

COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MoER, SF0690030s09 and ERDF (Estonia);

Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany);

GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS and RFBR (Russia);

MSTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEP, IPST and NECTEC (Thailand); TUBITAK and TAEK (Turkey);

NASU (Ukraine); STFC (United Kingdom); DOE and NSF (U.S.).

[1] ATLAS Collaboration,Phys. Lett. B 716, 1 (2012).

[2] CMS Collaboration,Phys. Lett. B 716, 30 (2012).

[3] S. L. Glashow,Nucl. Phys. 22, 579 (1961).

[4] S. Weinberg,Phys. Rev. Lett. 19, 1264 (1967).

[5] A. Salam, in Proceedings of the Eighth Nobel Symposium:

Elementary Particle Physics: Relativistic Groups and Analyticity, edited by N. Svartholm (Almqvist &

Wiskell, Stockholm, 1968), p. 367.

[6] P. W. Higgs,Phys. Lett. 12, 132 (1964).

[7] P. W. Higgs,Phys. Rev. Lett. 13, 508 (1964).

[8] P. W. Higgs,Phys. Rev. 145, 1156 (1966).

[9] F. Englert and R. Brout,Phys. Rev. Lett. 13, 321 (1964).

[10] G. S. Guralnik, C. R. Hagen, and T. W. B. Kibble, Phys.

Rev. Lett. 13, 585 (1964).

[11] T. W. B. Kibble,Phys. Rev. 155, 1554 (1967).

[12] L. D. Landau, Dokl. Akad. Nauk SSSR 60, 207 (1948).

[13] C.-N. Yang,Phys. Rev. 77, 242 (1950).

[14] CMS Collaboration,JINST 3, S08004 (2008).

[15] CMS Collaboration,Phys. Rev. Lett. 108, 111804 (2012).

[16] CMS Collaboration, CMS Physics Analysis Summary Report No. CMS-PAS-SMP-12-008, 2012 [http://cdsweb .cern.ch/record/1434360].

-2ln( / )

-30 -20 -10 0 10 20 30

Pseudoexperiments

0 500 1000 1500 2000 2500 3000

0+

0- Observed CMS

0+

0-

s = 7 (8) TeV, L = 5.1 (12.2) fb^-1

FIG. 3 (color online). Expected distribution of2 lnL0=L0^þ

under the pure pseudoscalar and pure scalar hypotheses (histograms). The arrow indicates the value determined from the observed data.

(5)

[17] CMS Collaboration, CMS Physics Analysis Summary Report No. CMS-PAS-LUM-12-001, 2012 [http://

cdsweb.cern.ch/record/1482193].

[18] LHC Higgs Cross Section Working Group, CERN Report No. CERN-2011-002, 2011 [http://cdsweb.cern.ch/

record/1318996].

[19] A. Denner, S. Heinemeyer, I. Puljak, D. Rebuzzi, and M.

Spira,Eur. Phys. J. C 71, 1753 (2011).

[20] CMS Collaboration, J. High Energy Phys. 12 (2012) 034.

[21] Y. Gao, A. V. Gritsan, Z. Guo, K. Melnikov, M. Schulze, and N. V. Tran,Phys. Rev. D 81, 075022 (2010).

[22] S. Bolognesi, Y. Gao, A. V. Gritsan, K. Melnikov, M. Schulze, N. V. Tran, and A. Whitbeck, Phys. Rev. D 86, 095031 (2012).

[23] Y. Chen, N. Tran, and R. Vega-Morales,arXiv:1211.1959.

[24] J. Beringer et al. (Particle Data Group),Phys. Rev. D 86, 010001 (2012).

[25] A. Soni and R. M. Xu, Phys. Rev. D 48, 5259 (1993).

[26] V. D. Barger, K. Cheung, A. Djouadi, B. A. Kniehl, and P. M. Zerwas,Phys. Rev. D 49, 79 (1994).

[27] S. Y. Choi, D. J. Miller, M. M. Muhlleitner, and P. M.

Zerwas,Phys. Lett. B 553, 61 (2003).

[28] B. C. Allanach, K. Odagiri, M. J. Palmer, M. A. Parker, A.

Sabetfakhri, and B. R. Webber, J. High Energy Phys. 12 (2002) 039.

[29] C. P. Buszello, I. Fleck, P. Marquard, and J. J. van der Bij, Eur. Phys. J. C 32, 209 (2004).

[30] R. M. Godbole, D. J. Miller, and M. M. Muhlleitner, J. High Energy Phys. 12 (2007) 031.

[31] W.-Y. Keung, I. Low, and J. Shu, Phys. Rev. Lett. 101, 091802 (2008).

[32] O. Antipin and A. Soni,J. High Energy Phys. 10 (2008) 018.

[33] K. Hagiwara, Q. Li, and K. Mawatari, J. High Energy Phys. 07 (2009) 101.

[34] A. De Rujula, J. Lykken, M. Pierini, C. Rogan, and M.

Spiropulu,Phys. Rev. D 82, 013003 (2010).

[35] J. S. Gainer, K. Kumar, I. Low, and R. Vega-Morales, J. High Energy Phys. 11 (2011) 027.

[36] A. L. Read,J. Phys. G 28, 2693 (2002).

[37] P. Avery, D. Bourilkov, M. Chen, T. Cheng, A.

Drozdetskiy, J. S. Gainer, A. Korytov, K. T. Matchev, P.

Milenovic, G. Mitselmakher, M. Park, and A. Rinkevicius, arXiv:1210.0896.

[38] 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 (2007) 028.

S. Chatrchyan,¹V. Khachatryan,¹A. M. Sirunyan,¹A. Tumasyan,¹W. Adam,²E. Aguilo,²T. Bergauer,² M. Dragicevic,²J. Ero¨,²C. Fabjan,^2,bM. Friedl,²R. Fru¨hwirth,^2,bV. M. Ghete,²N. Ho¨rmann,²J. Hrubec,² M. Jeitler,^2,bW. Kiesenhofer,²V. Knu¨nz,²M. Krammer,^2,bI. Kra¨tschmer,²D. Liko,²I. Mikulec,²M. Pernicka,^2,a D. Rabady,^2,cB. Rahbaran,²C. Rohringer,²H. Rohringer,²R. Scho¨fbeck,²J. Strauss,²A. Taurok,²W. Waltenberger,²

C.-E. Wulz,^2,bV. Mossolov,³N. Shumeiko,³J. Suarez Gonzalez,³S. Alderweireldt,⁴M. Bansal,⁴S. Bansal,⁴ T. Cornelis,⁴E. A. De Wolf,⁴X. Janssen,⁴S. Luyckx,⁴L. Mucibello,⁴S. Ochesanu,⁴B. Roland,⁴R. Rougny,⁴

H. Van Haevermaet,⁴P. Van Mechelen,⁴N. Van Remortel,⁴A. Van Spilbeeck,⁴F. Blekman,⁵S. Blyweert,⁵ J. D’Hondt,⁵R. Gonzalez Suarez,⁵A. Kalogeropoulos,⁵M. Maes,⁵A. Olbrechts,⁵S. Tavernier,⁵W. Van Doninck,⁵ P. Van Mulders,⁵G. P. Van Onsem,⁵I. Villella,⁵B. Clerbaux,⁶G. De Lentdecker,⁶V. Dero,⁶A. P. R. Gay,⁶T. Hreus,⁶

A. Le´onard,⁶P. E. Marage,⁶A. Mohammadi,⁶T. Reis,⁶L. Thomas,⁶C. Vander Velde,⁶P. Vanlaer,⁶J. Wang,⁶ V. Adler,⁷K. Beernaert,⁷A. Cimmino,⁷S. Costantini,⁷G. Garcia,⁷M. Grunewald,⁷B. Klein,⁷J. Lellouch,⁷ A. Marinov,⁷J. Mccartin,⁷A. A. Ocampo Rios,⁷D. Ryckbosch,⁷M. Sigamani,⁷N. Strobbe,⁷F. Thyssen,⁷M. Tytgat,⁷ S. Walsh,⁷E. Yazgan,⁷N. Zaganidis,⁷S. Basegmez,⁸G. Bruno,⁸R. Castello,⁸L. Ceard,⁸C. Delaere,⁸T. du Pree,⁸

D. Favart,⁸L. Forthomme,⁸A. Giammanco,^8,dJ. Hollar,⁸V. Lemaitre,⁸J. Liao,⁸O. Militaru,⁸C. Nuttens,⁸ D. Pagano,⁸A. Pin,⁸K. Piotrzkowski,⁸M. Selvaggi,⁸J. M. Vizan Garcia,⁸N. Beliy,⁹T. Caebergs,⁹E. Daubie,⁹

G. H. Hammad,⁹G. A. Alves,¹⁰M. Correa Martins Junior,¹⁰T. Martins,¹⁰M. E. Pol,¹⁰M. H. G. Souza,¹⁰ W. L. Alda´ Ju´nior,¹¹W. Carvalho,¹¹J. Chinellato,^11,eA. Custo´dio,¹¹E. M. Da Costa,¹¹D. De Jesus Damiao,¹¹

C. De Oliveira Martins,¹¹S. Fonseca De Souza,¹¹H. Malbouisson,¹¹M. Malek,¹¹D. Matos Figueiredo,¹¹ L. Mundim,¹¹H. Nogima,¹¹W. L. Prado Da Silva,¹¹A. Santoro,¹¹L. Soares Jorge,¹¹A. Sznajder,¹¹

E. J. Tonelli Manganote,^11,eA. Vilela Pereira,¹¹T. S. Anjos,^12bC. A. Bernardes,^12bF. A. Dias,^12a,f T. R. Fernandez Perez Tomei,^12aE. M. Gregores,^12bC. Lagana,^12aF. Marinho,^12aP. G. Mercadante,^12b S. F. Novaes,^12aSandra S. Padula,^12aV. Genchev,^13,cP. Iaydjiev,^13,cS. Piperov,¹³M. Rodozov,¹³S. Stoykova,¹³

G. Sultanov,¹³V. Tcholakov,¹³R. Trayanov,¹³M. Vutova,¹³A. Dimitrov,¹⁴R. Hadjiiska,¹⁴V. Kozhuharov,¹⁴ L. Litov,¹⁴B. Pavlov,¹⁴P. Petkov,¹⁴J. G. Bian,¹⁵G. M. Chen,¹⁵H. S. Chen,¹⁵C. H. Jiang,¹⁵D. Liang,¹⁵S. Liang,¹⁵

X. Meng,¹⁵J. Tao,¹⁵J. Wang,¹⁵X. Wang,¹⁵Z. Wang,¹⁵H. Xiao,¹⁵M. Xu,¹⁵J. Zang,¹⁵Z. Zhang,¹⁵ C. Asawatangtrakuldee,¹⁶Y. Ban,¹⁶Y. Guo,¹⁶W. Li,¹⁶S. Liu,¹⁶Y. Mao,¹⁶S. J. Qian,¹⁶H. Teng,¹⁶D. Wang,¹⁶

L. Zhang,¹⁶W. Zou,¹⁶C. Avila,¹⁷C. A. Carrillo Montoya,¹⁷J. P. Gomez,¹⁷B. Gomez Moreno,¹⁷ A. F. Osorio Oliveros,¹⁷J. C. Sanabria,¹⁷N. Godinovic,¹⁸D. Lelas,¹⁸R. Plestina,^18,gD. Polic,¹⁸I. Puljak,¹⁸ Z. Antunovic,¹⁹M. Kovac,¹⁹V. Brigljevic,²⁰S. Duric,²⁰K. Kadija,²⁰J. Luetic,²⁰D. Mekterovic,²⁰S. Morovic,²⁰

(6)

L. Tikvica,²⁰A. Attikis,²¹G. Mavromanolakis,²¹J. Mousa,²¹C. Nicolaou,²¹F. Ptochos,²¹P. A. Razis,²¹M. Finger,²² M. Finger, Jr.,²²Y. Assran,^23,hS. Elgammal,^23,iA. Ellithi Kamel,^23,jA. M. Kuotb Awad,^23,kM. A. Mahmoud,^23,k

A. Radi,^23,l,mM. Kadastik,²⁴M. Mu¨ntel,²⁴M. Murumaa,²⁴M. Raidal,²⁴L. Rebane,²⁴A. Tiko,²⁴P. Eerola,²⁵ G. Fedi,²⁵M. Voutilainen,²⁵J. Ha¨rko¨nen,²⁶A. Heikkinen,²⁶V. Karima¨ki,²⁶R. Kinnunen,²⁶M. J. Kortelainen,²⁶ T. Lampeń,²⁶K. Lassila-Perini,²⁶S. Lehti,²⁶T. Lindeń,²⁶P. Luukka,²⁶T. Maënpaä¨,²⁶T. Peltola,²⁶E. Tuominen,²⁶

J. Tuominiemi,²⁶E. Tuovinen,²⁶D. Ungaro,²⁶L. Wendland,²⁶A. Korpela,²⁷T. Tuuva,²⁷M. Besancon,²⁸ S. Choudhury,²⁸F. Couderc,²⁸M. Dejardin,²⁸D. Denegri,²⁸B. Fabbro,²⁸J. L. Faure,²⁸F. Ferri,²⁸S. Ganjour,²⁸

A. Givernaud,²⁸P. Gras,²⁸G. Hamel de Monchenault,²⁸P. Jarry,²⁸E. Locci,²⁸J. Malcles,²⁸L. Millischer,²⁸ A. Nayak,²⁸J. Rander,²⁸A. Rosowsky,²⁸M. Titov,²⁸S. Baffioni,²⁹F. Beaudette,²⁹L. Benhabib,²⁹L. Bianchini,²⁹

M. Bluj,^29,nP. Busson,²⁹C. Charlot,²⁹N. Daci,²⁹T. Dahms,²⁹M. Dalchenko,²⁹L. Dobrzynski,²⁹A. Florent,²⁹ R. Granier de Cassagnac,²⁹M. Haguenauer,²⁹P. Mine´,²⁹C. Mironov,²⁹I. N. Naranjo,²⁹M. Nguyen,²⁹C. Ochando,²⁹ P. Paganini,²⁹D. Sabes,²⁹R. Salerno,²⁹Y. Sirois,²⁹C. Veelken,²⁹A. Zabi,²⁹J.-L. Agram,^30,oJ. Andrea,³⁰D. Bloch,³⁰ D. Bodin,³⁰J.-M. Brom,³⁰E. C. Chabert,³⁰C. Collard,³⁰E. Conte,^30,oF. Drouhin,^30,oJ.-C. Fontaine,^30,oD. Gele´,³⁰

U. Goerlach,³⁰P. Juillot,³⁰A.-C. Le Bihan,³⁰P. Van Hove,³⁰S. Beauceron,³¹N. Beaupere,³¹O. Bondu,³¹ G. Boudoul,³¹S. Brochet,³¹J. Chasserat,³¹R. Chierici,^31,cD. Contardo,³¹P. Depasse,³¹H. El Mamouni,³¹J. Fay,³¹

S. Gascon,³¹M. Gouzevitch,³¹B. Ille,³¹T. Kurca,³¹M. Lethuillier,³¹L. Mirabito,³¹S. Perries,³¹L. Sgandurra,³¹ V. Sordini,³¹Y. Tschudi,³¹P. Verdier,³¹S. Viret,³¹Z. Tsamalaidze,^32,pC. Autermann,³³S. Beranek,³³B. Calpas,³³

M. Edelhoff,³³L. Feld,³³N. Heracleous,³³O. Hindrichs,³³R. Jussen,³³K. Klein,³³J. Merz,³³A. Ostapchuk,³³ A. Perieanu,³³F. Raupach,³³J. Sammet,³³S. Schael,³³D. Sprenger,³³H. Weber,³³B. Wittmer,³³V. Zhukov,^33,q M. Ata,³⁴J. Caudron,³⁴E. Dietz-Laursonn,³⁴D. Duchardt,³⁴M. Erdmann,³⁴R. Fischer,³⁴A. Gu¨th,³⁴T. Hebbeker,³⁴

C. Heidemann,³⁴K. Hoepfner,³⁴D. Klingebiel,³⁴P. Kreuzer,³⁴M. Merschmeyer,³⁴A. Meyer,³⁴M. Olschewski,³⁴ K. Padeken,³⁴P. Papacz,³⁴H. Pieta,³⁴H. Reithler,³⁴S. A. Schmitz,³⁴L. Sonnenschein,³⁴J. Steggemann,³⁴ D. Teyssier,³⁴S. Thu¨er,³⁴M. Weber,³⁴M. Bontenackels,³⁵V. Cherepanov,³⁵Y. Erdogan,³⁵G. Flu¨gge,³⁵H. Geenen,³⁵ M. Geisler,³⁵W. Haj Ahmad,³⁵F. Hoehle,³⁵B. Kargoll,³⁵T. Kress,³⁵Y. Kuessel,³⁵J. Lingemann,^35,cA. Nowack,³⁵ I. M. Nugent,³⁵L. Perchalla,³⁵O. Pooth,³⁵P. Sauerland,³⁵A. Stahl,³⁵M. Aldaya Martin,³⁶I. Asin,³⁶N. Bartosik,³⁶ J. Behr,³⁶W. Behrenhoff,³⁶U. Behrens,³⁶M. Bergholz,^36,rA. Bethani,³⁶K. Borras,³⁶A. Burgmeier,³⁶A. Cakir,³⁶

L. Calligaris,³⁶A. Campbell,³⁶E. Castro,³⁶F. Costanza,³⁶D. Dammann,³⁶C. Diez Pardos,³⁶T. Dorland,³⁶ G. Eckerlin,³⁶D. Eckstein,³⁶G. Flucke,³⁶A. Geiser,³⁶I. Glushkov,³⁶P. Gunnellini,³⁶S. Habib,³⁶J. Hauk,³⁶ G. Hellwig,³⁶H. Jung,³⁶M. Kasemann,³⁶P. Katsas,³⁶C. Kleinwort,³⁶H. Kluge,³⁶A. Knutsson,³⁶M. Kra¨mer,³⁶

D. Kru¨cker,³⁶E. Kuznetsova,³⁶W. Lange,³⁶J. Leonard,³⁶W. Lohmann,^36,rB. Lutz,³⁶R. Mankel,³⁶I. Marfin,³⁶ M. Marienfeld,³⁶I.-A. Melzer-Pellmann,³⁶A. B. Meyer,³⁶J. Mnich,³⁶A. Mussgiller,³⁶S. Naumann-Emme,³⁶

O. Novgorodova,³⁶F. Nowak,³⁶J. Olzem,³⁶H. Perrey,³⁶A. Petrukhin,³⁶D. Pitzl,³⁶A. Raspereza,³⁶ P. M. Ribeiro Cipriano,³⁶C. Riedl,³⁶E. Ron,³⁶M. Rosin,³⁶J. Salfeld-Nebgen,³⁶R. Schmidt,^36,r

T. Schoerner-Sadenius,³⁶N. Sen,³⁶A. Spiridonov,³⁶M. Stein,³⁶R. Walsh,³⁶C. Wissing,³⁶V. Blobel,³⁷H. Enderle,³⁷ J. Erfle,³⁷U. Gebbert,³⁷M. Go¨rner,³⁷M. Gosselink,³⁷J. Haller,³⁷T. Hermanns,³⁷R. S. Ho¨ing,³⁷K. Kaschube,³⁷ G. Kaussen,³⁷H. Kirschenmann,³⁷R. Klanner,³⁷J. Lange,³⁷T. Peiffer,³⁷N. Pietsch,³⁷D. Rathjens,³⁷C. Sander,³⁷ H. Schettler,³⁷P. Schleper,³⁷E. Schlieckau,³⁷A. Schmidt,³⁷M. Schro¨der,³⁷T. Schum,³⁷M. Seidel,³⁷J. Sibille,^37,s V. Sola,³⁷H. Stadie,³⁷G. Steinbru¨ck,³⁷J. Thomsen,³⁷L. Vanelderen,³⁷C. Barth,³⁸C. Baus,³⁸J. Berger,³⁸C. Bo¨ser,³⁸

T. Chwalek,³⁸W. De Boer,³⁸A. Descroix,³⁸A. Dierlamm,³⁸M. Feindt,³⁸M. Guthoff,^38,cC. Hackstein,³⁸ F. Hartmann,^38,cT. Hauth,^38,cM. Heinrich,³⁸H. Held,³⁸K. H. Hoffmann,³⁸U. Husemann,³⁸I. Katkov,^38,q J. R. Komaragiri,³⁸P. Lobelle Pardo,³⁸D. Martschei,³⁸S. Mueller,³⁸Th. Mu¨ller,³⁸M. Niegel,³⁸A. Nu¨rnberg,³⁸

O. Oberst,³⁸A. Oehler,³⁸J. Ott,³⁸G. Quast,³⁸K. Rabbertz,³⁸F. Ratnikov,³⁸N. Ratnikova,³⁸S. Ro¨cker,³⁸ F.-P. Schilling,³⁸G. Schott,³⁸H. J. Simonis,³⁸F. M. Stober,³⁸D. Troendle,³⁸R. Ulrich,³⁸J. Wagner-Kuhr,³⁸ S. Wayand,³⁸T. Weiler,³⁸M. Zeise,³⁸G. Anagnostou,³⁹G. Daskalakis,³⁹T. Geralis,³⁹S. Kesisoglou,³⁹A. Kyriakis,³⁹

D. Loukas,³⁹A. Markou,³⁹C. Markou,³⁹E. Ntomari,³⁹L. Gouskos,⁴⁰T. J. Mertzimekis,⁴⁰A. Panagiotou,⁴⁰ N. Saoulidou,⁴⁰I. Evangelou,⁴¹C. Foudas,⁴¹P. Kokkas,⁴¹N. Manthos,⁴¹I. Papadopoulos,⁴¹G. Bencze,⁴²C. Hajdu,⁴² P. Hidas,⁴²D. Horvath,^42,tF. Sikler,⁴²V. Veszpremi,⁴²G. Vesztergombi,^42,uA. J. Zsigmond,⁴²N. Beni,⁴³S. Czellar,⁴³

J. Molnar,⁴³J. Palinkas,⁴³Z. Szillasi,⁴³J. Karancsi,⁴⁴P. Raics,⁴⁴Z. L. Trocsanyi,⁴⁴B. Ujvari,⁴⁴S. B. Beri,⁴⁵ V. Bhatnagar,⁴⁵N. Dhingra,⁴⁵R. Gupta,⁴⁵M. Kaur,⁴⁵M. Z. Mehta,⁴⁵M. Mittal,⁴⁵N. Nishu,⁴⁵L. K. Saini,⁴⁵ A. Sharma,⁴⁵J. B. Singh,⁴⁵Ashok Kumar,⁴⁶Arun Kumar,⁴⁶S. Ahuja,⁴⁶A. Bhardwaj,⁴⁶B. C. Choudhary,⁴⁶

S. Malhotra,⁴⁶M. Naimuddin,⁴⁶K. Ranjan,⁴⁶P. Saxena,⁴⁶V. Sharma,⁴⁶R. K. Shivpuri,⁴⁶S. Banerjee,⁴⁷

(7)

S. Bhattacharya,⁴⁷K. Chatterjee,⁴⁷S. Dutta,⁴⁷B. Gomber,⁴⁷Sa. Jain,⁴⁷Sh. Jain,⁴⁷R. Khurana,⁴⁷A. Modak,⁴⁷ S. Mukherjee,⁴⁷D. Roy,⁴⁷S. Sarkar,⁴⁷M. Sharan,⁴⁷A. Abdulsalam,⁴⁸D. Dutta,⁴⁸S. Kailas,⁴⁸V. Kumar,⁴⁸

A. K. Mohanty,^48,cL. M. Pant,⁴⁸P. Shukla,⁴⁸T. Aziz,⁴⁹R. M. Chatterjee,⁴⁹S. Ganguly,⁴⁹M. Guchait,^49,v A. Gurtu,^49,wM. Maity,^49,xG. Majumder,⁴⁹K. Mazumdar,⁴⁹G. B. Mohanty,⁴⁹B. Parida,⁴⁹K. Sudhakar,⁴⁹ N. Wickramage,⁴⁹S. Banerjee,⁵⁰S. Dugad,⁵⁰H. Arfaei,^51,yH. Bakhshiansohi,⁵¹S. M. Etesami,^51,zA. Fahim,^51,y M. Hashemi,^51,aaH. Hesari,⁵¹A. Jafari,⁵¹M. Khakzad,⁵¹M. Mohammadi Najafabadi,⁵¹S. Paktinat Mehdiabadi,⁵¹

B. Safarzadeh,^51,bbM. Zeinali,⁵¹M. Abbrescia,^52a,52bL. Barbone,^52a,52bC. Calabria,^52a,52b,cS. S. Chhibra,^52a,52b A. Colaleo,^52aD. Creanza,^52a,52cN. De Filippis,^52a,52c,cM. De Palma,^52a,52bL. Fiore,^52aG. Iaselli,^52a,52c G. Maggi,^52a,52cM. Maggi,^52aB. Marangelli,^52a,52bS. My,^52a,52cS. Nuzzo,^52a,52bN. Pacifico,^52aA. Pompili,^52a,52b G. Pugliese,^52a,52cG. Selvaggi,^52a,52bL. Silvestris,^52aG. Singh,^52a,52bR. Venditti,^52a,52bP. Verwilligen,^52aG. Zito,^52a

G. Abbiendi,^53aA. C. Benvenuti,^53aD. Bonacorsi,^53a,53bS. Braibant-Giacomelli,^53a,53bL. Brigliadori,^53a,53b P. Capiluppi,^53a,53bA. Castro,^53a,53bF. R. Cavallo,^53aM. Cuffiani,^53a,53bG. M. Dallavalle,^53aF. Fabbri,^53a A. Fanfani,^53a,53bD. Fasanella,^53a,53bP. Giacomelli,^53aC. Grandi,^53aL. Guiducci,^53a,53bS. Marcellini,^53a G. Masetti,^53aM. Meneghelli,^53a,53b,cA. Montanari,^53aF. L. Navarria,^53a,53bF. Odorici,^53aA. Perrotta,^53a F. Primavera,^53a,53bA. M. Rossi,^53a,53bT. Rovelli,^53a,53bG. P. Siroli,^53a,53bN. Tosi,^53aR. Travaglini,^53a,53b S. Albergo,^54a,54bG. Cappello,^54a,54bM. Chiorboli,^54a,54bS. Costa,^54a,54bR. Potenza,^54a,54bA. Tricomi,^54a,54b

C. Tuve,^54a,54bG. Barbagli,^55aV. Ciulli,^55a,55bC. Civinini,^55aR. D’Alessandro,^55a,55bE. Focardi,^55a,55b S. Frosali,^55a,55bE. Gallo,^55aS. Gonzi,^55a,55bM. Meschini,^55aS. Paoletti,^55aG. Sguazzoni,^55aA. Tropiano,^55a,55b

L. Benussi,⁵⁶S. Bianco,⁵⁶S. Colafranceschi,^56,ccF. Fabbri,⁵⁶D. Piccolo,⁵⁶P. Fabbricatore,^57aR. Musenich,^57a S. Tosi,^57a,57bA. Benaglia,^58aF. De Guio,^58a,58bL. Di Matteo,^58a,58b,cS. Fiorendi,^58a,58bS. Gennai,^58a,c A. Ghezzi,^58a,58bM. T. Lucchini,^58a,cS. Malvezzi,^58aR. A. Manzoni,^58a,58bA. Martelli,^58a,58bA. Massironi,^58a,58b

D. Menasce,^58aL. Moroni,^58aM. Paganoni,^58a,58bD. Pedrini,^58aS. Ragazzi,^58a,58bN. Redaelli,^58a T. Tabarelli de Fatis,^58a,58bS. Buontempo,^59aN. Cavallo,^59a,59cA. De Cosa,^59a,59b,cO. Dogangun,^59a,59b F. Fabozzi,^59a,59cA. O. M. Iorio,^59a,59bL. Lista,^59aS. Meola,^59a,59d,cM. Merola,^59aP. Paolucci,^59a,cP. Azzi,^60a

N. Bacchetta,^60a,cD. Bisello,^60a,60bA. Branca,^60a,60b,cR. Carlin,^60a,60bP. Checchia,^60aT. Dorigo,^60a M. Galanti,^60a,60bF. Gasparini,^60a,60bU. Gasparini,^60a,60bA. Gozzelino,^60a,60bK. Kanishchev,^60a,60cS. Lacaprara,^60a

I. Lazzizzera,^60a,60cM. Margoni,^60a,60bA. T. Meneguzzo,^60a,60bJ. Pazzini,^60a,60bN. Pozzobon,^60a,60b P. Ronchese,^60a,60bF. Simonetto,^60a,60bE. Torassa,^60aM. Tosi,^60a,60bS. Vanini,^60a,60bP. Zotto,^60a,60b A. Zucchetta,^60a,60bG. Zumerle,^60a,60bM. Gabusi,^61a,61bS. P. Ratti,^61a,61bC. Riccardi,^61a,61bP. Torre,^61a,61b

P. Vitulo,^61a,61bM. Biasini,^62a,62bG. M. Bilei,^62aL. Fano`,^62a,62bP. Lariccia,^62a,62bG. Mantovani,^62a,62b M. Menichelli,^62aA. Nappi,^62a,62b,aF. Romeo,^62a,62bA. Saha,^62aA. Santocchia,^62a,62bA. Spiezia,^62a,62b S. Taroni,^62a,62bP. Azzurri,^63a,63cG. Bagliesi,^63aJ. Bernardini,^63aT. Boccali,^63aG. Broccolo,^63a,63cR. Castaldi,^63a R. T. D’Agnolo,^63a,63c,cR. Dell’Orso,^63aF. Fiori,^63a,63b,cL. Foa`,^63a,63cA. Giassi,^63aA. Kraan,^63aF. Ligabue,^63a,63c T. Lomtadze,^63aL. Martini,^63a,ddA. Messineo,^63a,63bF. Palla,^63aA. Rizzi,^63a,63bA. T. Serban,^63a,eeP. Spagnolo,^63a P. Squillacioti,^63a,cR. Tenchini,^63aG. Tonelli,^63a,63bA. Venturi,^63aP. G. Verdini,^63aL. Barone,^64a,64bF. Cavallari,^64a

D. Del Re,^64a,64bM. Diemoz,^64aC. Fanelli,^64a,64bM. Grassi,^64a,64b,cE. Longo,^64a,64bP. Meridiani,^64a,c F. Micheli,^64a,64bS. Nourbakhsh,^64a,64bG. Organtini,^64a,64bR. Paramatti,^64aS. Rahatlou,^64a,64bL. Soffi,^64a,64b

N. Amapane,^65a,65bR. Arcidiacono,^65a,65cS. Argiro,^65a,65bM. Arneodo,^65a,65cC. Biino,^65aN. Cartiglia,^65a S. Casasso,^65a,65bM. Costa,^65a,65bN. Demaria,^65aC. Mariotti,^65a,cS. Maselli,^65aE. Migliore,^65a,65bV. Monaco,^65a,65b

M. Musich,^65a,cM. M. Obertino,^65a,65cN. Pastrone,^65aM. Pelliccioni,^65aA. Potenza,^65a,65bA. Romero,^65a,65b M. Ruspa,^65a,65cR. Sacchi,^65a,65bA. Solano,^65a,65bA. Staiano,^65aS. Belforte,^66aV. Candelise,^66a,66bM. Casarsa,^66a

F. Cossutti,^66a,cG. Della Ricca,^66a,66bB. Gobbo,^66aM. Marone,^66a,66b,cD. Montanino,^66a,66bA. Penzo,^66a A. Schizzi,^66a,66bT. Y. Kim,⁶⁷S. K. Nam,⁶⁷S. Chang,⁶⁸D. H. Kim,⁶⁸G. N. Kim,⁶⁸D. J. Kong,⁶⁸H. Park,⁶⁸ D. C. Son,⁶⁸J. Y. Kim,⁶⁹Zero J. Kim,⁶⁹S. Song,⁶⁹S. Choi,⁷⁰D. Gyun,⁷⁰B. Hong,⁷⁰M. Jo,⁷⁰H. Kim,⁷⁰T. J. Kim,⁷⁰ K. S. Lee,⁷⁰D. H. Moon,⁷⁰S. K. Park,⁷⁰Y. Roh,⁷⁰M. Choi,⁷¹J. H. Kim,⁷¹C. Park,⁷¹I. C. Park,⁷¹S. Park,⁷¹G. Ryu,⁷¹

Y. Choi,⁷²Y. K. Choi,⁷²J. Goh,⁷²M. S. Kim,⁷²E. Kwon,⁷²B. Lee,⁷²J. Lee,⁷²S. Lee,⁷²H. Seo,⁷²I. Yu,⁷² M. J. Bilinskas,⁷³I. Grigelionis,⁷³M. Janulis,⁷³A. Juodagalvis,⁷³H. Castilla-Valdez,⁷⁴E. De La Cruz-Burelo,⁷⁴

I. Heredia-de La Cruz,⁷⁴R. Lopez-Fernandez,⁷⁴J. Martı´nez-Ortega,⁷⁴A. Sanchez-Hernandez,⁷⁴ L. M. Villasenor-Cendejas,⁷⁴S. Carrillo Moreno,⁷⁵F. Vazquez Valencia,⁷⁵H. A. Salazar Ibarguen,⁷⁶ E. Casimiro Linares,⁷⁷A. Morelos Pineda,⁷⁷M. A. Reyes-Santos,⁷⁷D. Krofcheck,⁷⁸A. J. Bell,⁷⁹P. H. Butler,⁷⁹ R. Doesburg,⁷⁹S. Reucroft,⁷⁹H. Silverwood,⁷⁹M. Ahmad,⁸⁰M. I. Asghar,⁸⁰J. Butt,⁸⁰H. R. Hoorani,⁸⁰S. Khalid,⁸⁰