Measurement of the underlying event activity at the LHC with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$ \sqrt {s} = 7 $\end{document} TeV and comparison with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$ \sqrt {s} = 0.9 $\end{document} TeV

被引：0
作者：
S. Chatrchyan
V. Khachatryan
A. M. Sirunyan
A. Tumasyan
W. Adam
T. Bergauer
M. Dragicevic
J. Erö
C. Fabjan
M. Friedl
R. Frühwirth
V. M. Ghete
J. Hammer
S. Hänsel
M. Hoch
N. Hörmann
J. Hrubec
M. Jeitler
W. Kiesenhofer
M. Krammer
D. Liko
I. Mikulec
M. Pernicka
H. Rohringer
R. Schöfbeck
J. Strauss
A. Taurok
F. Teischinger
P. Wagner
W. Waltenberger
G. Walzel
E. Widl
C.-E. Wulz
V. Mossolov
N. Shumeiko
J. Suarez Gonzalez
S. Bansal
L. Benucci
E. A. De Wolf
X. Janssen
J. Maes
T. Maes
L. Mucibello
S. Ochesanu
B. Roland
R. Rougny
M. Selvaggi
H. Van Haevermaet
P. Van Mechelen
N. Van Remortel
机构：
[1] Yerevan Physics Institute,Instituto de Fisica Teorica
[2] Institut für Hochenergiephysik der OeAW,State Key Lab. of Nucl. Phys. and Tech.
[3] National Centre for Particle and High Energy Physics,Academy of Scientific Research and Technology of the Arab Republic of Egypt
[4] Universiteit Antwerpen,Department of Physics
[5] Vrije Universiteit Brussel,Institute of High Energy Physics and Informatization
[6] Université Libre de Bruxelles,Chonnam National University
[7] Ghent University,National Centre for Physics
[8] Université Catholique de Louvain,Institute of Experimental Physics, Faculty of Physics
[9] Université de Mons,State Research Center of Russian Federation
[10] Centro Brasileiro de Pesquisas Fisicas,Instituto de Física de Cantabria (IFCA)
[11] Universidade do Estado do Rio de Janeiro,Institute for Particle Physics
[12] Universidade Estadual Paulista,National Scientific Center
[13] Institute for Nuclear Research and Nuclear Energy,School of Physics and Astronomy
[14] University of Sofia,undefined
[15] Institute of High Energy Physics,undefined
[16] Peking University,undefined
[17] Universidad de Los Andes,undefined
[18] Technical University of Split,undefined
[19] University of Split,undefined
[20] Institute Rudjer Boskovic,undefined
[21] University of Cyprus,undefined
[22] Charles University,undefined
[23] Egyptian Network of High Energy Physics,undefined
[24] National Institute of Chemical Physics and Biophysics,undefined
[25] University of Helsinki,undefined
[26] Helsinki Institute of Physics,undefined
[27] Lappeenranta University of Technology,undefined
[28] Laboratoire d’Annecy-le-Vieux de Physique des Particules,undefined
[29] IN2P3-CNRS,undefined
[30] DSM/IRFU,undefined
[31] CEA/Saclay,undefined
[32] Laboratoire Leprince-Ringuet,undefined
[33] Ecole Polytechnique,undefined
[34] IN2P3-CNRS,undefined
[35] Institut Pluridisciplinaire Hubert Curien,undefined
[36] Université de Strasbourg,undefined
[37] Université de Haute Alsace Mulhouse,undefined
[38] CNRS/IN2P3,undefined
[39] Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules (IN2P3),undefined
[40] Université de Lyon,undefined
[41] Université Claude Bernard Lyon 1,undefined
[42] CNRS-IN2P3,undefined
[43] Institut de Physique Nucléaire de Lyon,undefined
[44] Tbilisi State University,undefined
[45] RWTH Aachen University,undefined
[46] I. Physikalisches Institut,undefined
[47] RWTH Aachen University,undefined
[48] III. Physikalisches Institut A,undefined
[49] RWTH Aachen University,undefined
[50] III. Physikalisches Institut B,undefined
来源：
Journal of High Energy Physics | / 2011卷 / 9期
关键词：
Hadron-Hadron Scattering;
D O I：
10.1007/JHEP09(2011)109
中图分类号：
学科分类号：
摘要：
A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$ \sqrt {s} = 0.9 $\end{document} and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η| < 2 and transverse momentum pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading track-jet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.
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[1]  
Khachatryan V(2010)Measurement of the underlying event activity in proton-proton collisions at 0.9 TeV Eur. Phys. J. C 70 555-undefined
[2]  
Aad G(2011)Measurement of underlying event characteristics using charged particles in pp collisions at Phys. Rev. D 83 112001-undefined
[3]  
Sjöstrand T(1987) GeV and 7 TeV with the ATLAS detector Phys. Lett. B 188 149-undefined
[4]  
van Zijl M(2011)Multiple parton-parton interactions in an impact parameter picture Phys. Rev. D 83 054012-undefined
[5]  
Frankfurt L(2006)Transverse nucleon structure and diagnostics of hard parton-parton processes at LHC JHEP 05 026-undefined
[6]  
Strikman M(2008) 6.4 physics and manual Comput. Phys. Commun. 178 852-undefined
[7]  
Weiss C(2008)A brief introduction to Acta Phys. Polon. B 39 2611-undefined
[8]  
Sjöstrand T(2007) 81 Eur. Phys. J. C 52 133-undefined
[9]  
Mrenna S(2010)Physics at the Tevatron Eur. Phys. J. C 65 331-undefined
[10]  
Skands PZ(2011)Non-perturbative QCD effects and the top mass at the Tevatron New J. Phys. 13 053033-undefined
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