Production of prompt J/psi meson pairs in proton-proton collisions at sqrt(s) = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb^{-1}. The two J/psi mesons are fully reconstructed via their decays into mu+ mu− pairs. This observation provides for the first time access to the high-transverse-momentum region of J/psi pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/psi transverse momentum (pT_J/psi) and rapidity (|y_J/psi|): |y_J/psi| < 1.2 for pT_J/psi > 6.5 GeV/c; 1.2 < |y_J/psi| < 1.43 for a pT threshold that scales linearly with |y_J/psi| from 6.5 to 4.5 GeV/c; and 1.43 < |y_J/psi| < 2.2 for pT_J/psi > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/psi pair production is 1.49 +/- 0.07 (stat) +/- 0.13 (syst) nb. Different assumptions about the J/psi polarization imply modifications to the cross section ranging from -31% to +27%.

Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV / V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth, V. M. Ghete, C. Hartl, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. Liko, et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - STAMPA. - 09:094:(2014), pp. 1-35. [10.1007/JHEP09(2014)094]

Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV

CIULLI, VITALIANO;D'ALESSANDRO, RAFFAELLO;FOCARDI, ETTORE;GONZI, SANDRO;GORI, VALENTINA;LENZI, PIERGIULIO;TROPIANO, ANTONIO;
2014

Abstract

Production of prompt J/psi meson pairs in proton-proton collisions at sqrt(s) = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb^{-1}. The two J/psi mesons are fully reconstructed via their decays into mu+ mu− pairs. This observation provides for the first time access to the high-transverse-momentum region of J/psi pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/psi transverse momentum (pT_J/psi) and rapidity (|y_J/psi|): |y_J/psi| < 1.2 for pT_J/psi > 6.5 GeV/c; 1.2 < |y_J/psi| < 1.43 for a pT threshold that scales linearly with |y_J/psi| from 6.5 to 4.5 GeV/c; and 1.43 < |y_J/psi| < 2.2 for pT_J/psi > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/psi pair production is 1.49 +/- 0.07 (stat) +/- 0.13 (syst) nb. Different assumptions about the J/psi polarization imply modifications to the cross section ranging from -31% to +27%.
2014
09:094
1
35
V. Khachatryan; A. M. Sirunyan; A. Tumasyan; W. Adam; T. Bergauer; M. Dragicevic; J. Erö; C. Fabjan; M. Friedl; R. Frühwirth; V. M. Ghete; C. Hartl; N...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/899348
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