Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at √s=7 TeV

被引:0
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作者
Chatrchyan, S. [1 ]
Khachatryan, V. [1 ]
Sirunyan, A. M. [1 ]
Tumasyan, A. [1 ]
Adam, W. [2 ]
Bergauer, T. [2 ]
Dragicevic, M. [2 ]
Eroe, J. [2 ]
Fabjan, C. [2 ]
Friedl, M. [2 ]
Fruehwirth, R. [2 ]
Ghete, V. M. [2 ]
Hammer, J. [2 ,117 ]
Hoch, M. [2 ]
Hoermann, N. [2 ]
Hrubec, J. [2 ]
Jeitler, M. [2 ]
Kiesenhofer, W. [2 ]
Krammer, M. [2 ]
Liko, D. [2 ]
Mikulec, I. [2 ]
Pernicka, M. [2 ]
Rahbaran, B. [2 ]
Rohringer, C. [2 ]
Rohringer, H. [2 ]
Schoefbeck, R. [2 ]
Strauss, J. [2 ]
Taurok, A. [2 ]
Teischinger, F. [2 ]
Wagner, P. [2 ]
Waltenberger, W. [2 ]
Walzel, G. [2 ]
Widl, E. [2 ]
Wulz, C-E. [2 ]
Mossolov, V. [3 ]
Shumeiko, N. [3 ]
Gonzalez, J. Suarez [3 ]
Bansal, S. [4 ]
Benucci, L. [4 ,63 ]
Cornelis, T. [4 ]
De Wolf, E. A. [4 ]
Janssen, X. [4 ]
Luyckx, S. [4 ]
Maes, T. [4 ]
Mucibello, L. [4 ]
Ochesanu, S. [4 ]
Roland, B. [4 ]
Rougny, R. [4 ]
Selvaggi, M. [4 ]
Van Haevermaet, H. [4 ]
机构
[1] Yerevan Phys Inst, Yerevan 375036, Armenia
[2] Inst Hochenergiephys OeAW, Vienna, Austria
[3] Natl Ctr Particle & High Energy Phys, Minsk, BELARUS
[4] Univ Antwerp, B-2020 Antwerp, Belgium
[5] Vrije Univ Brussel, Brussels, Belgium
[6] Univ Libre Bruxelles, Brussels, Belgium
[7] Univ Ghent, B-9000 Ghent, Belgium
[8] Catholic Univ Louvain, B-1348 Louvain, Belgium
[9] Univ Mons, B-7000 Mons, Belgium
[10] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
[11] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil
[12] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil
[13] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria
[14] Univ Sofia, BU-1126 Sofia, Bulgaria
[15] Inst High Energy Phys, Beijing 100039, Peoples R China
[16] Peking Univ, State Key Lab Nucl Phys & Tech, Beijing 100871, Peoples R China
[17] Univ Los Andes, Bogota, Colombia
[18] Tech Univ Split, Split, Croatia
[19] Univ Split, Split, Croatia
[20] Rudjer Boskovic Inst, Zagreb, Croatia
[21] Univ Cyprus, Nicosia, Cyprus
[22] Charles Univ Prague, Prague, Czech Republic
[23] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt
[24] NICPB, Tallinn, Estonia
[25] Univ Helsinki, Dept Phys, Helsinki, Finland
[26] Helsinki Inst Phys, Helsinki, Finland
[27] Lappeenranta Univ Technol, Lappeenranta, Finland
[28] IN2P3 CNRS, Lab Annecy Le Vieux Phys Particules, Annecy Le Vieux, France
[29] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France
[30] Ecole Polytech, IN2P3 CNRS, Lab Leprince Ringuet, Palaiseau, France
[31] Univ Haute Alsace Mulhouse, Inst Pluridisciplinaire Hubert Curien, CNRS IN2P3, Univ Strasbourg, Strasbourg, France
[32] Inst Natl Phys Nucl & Phys Particules IN2P3, Ctr Calcul, Villeurbanne, France
[33] Univ Lyon 1, CNRS IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France
[34] Tbilisi State Univ, Inst High Energy Phys & Informatizat, GE-380086 Tbilisi, Georgia
[35] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany
[36] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
[37] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany
[38] DESY, Hamburg, Germany
[39] Univ Hamburg, Hamburg, Germany
[40] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany
[41] Inst Nucl Phys Demokritos, Aghia Paraskevi, Greece
[42] Univ Athens, Athens, Greece
[43] Univ Ioannina, GR-45110 Ioannina, Greece
[44] KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary
[45] Inst Nucl Res ATOMKI, Debrecen, Hungary
[46] Univ Debrecen, Debrecen, Hungary
[47] Panjab Univ, Chandigarh 160014, India
[48] Univ Delhi, Delhi 110007, India
[49] Saha Inst Nucl Phys, Kolkata, India
[50] Bhabha Atom Res Ctr, Mumbai 400085, Maharashtra, India
来源
EUROPEAN PHYSICAL JOURNAL C | 2012年 / 72卷 / 09期
基金
英国科学技术设施理事会; 巴西圣保罗研究基金会; 俄罗斯基础研究基金会; 中国国家自然科学基金; 芬兰科学院; 美国国家科学基金会; 欧洲研究理事会;
关键词
FRAGMENTATION;
D O I
10.1140/epjc/s10052-012-2080-4
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
A measurement of the underlying event (UE) activity in proton-proton collisions at a center-of-mass energy of 7 TeV is performed using Drell-Yan events in a data sample corresponding to an integrated luminosity of 2.2 fb(-1), collected by the CMS experiment at the LHC. The activity measured in the muonic final state (q (q) over bar -> mu(+) mu(-)) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by PYTHIA and HERWIG++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV/c(2), while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by MADGRAPH, which simulates multiple hard emissions.
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