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Measurement of J/ψ and ψ(2S) prompt double-differential cross sections in pp collisions at √s = 7 TeV

Author(s)
Apyan, Aram; Barbieri, Richard Alexander; Bierwagen, Katharina; Busza, Wit; Cali, Ivan Amos; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; Sumorok, Konstanty C; Wyslouch, Victoria; ... Show more Show less
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Abstract
The double-differential cross sections of promptly produced J/ψ and ψ(2S) mesons are measured in pp collisions at √s = 7  TeV, as a function of transverse momentum p[subscript T] and absolute rapidity |y|. The analysis uses J/ψ and ψ(2S) dimuon samples collected by the CMS experiment, corresponding to integrated luminosities of 4.55 and 4.90  fb[superscript −1], respectively. The results are based on a two-dimensional analysis of the dimuon invariant mass and decay length, and extend to p[subscript T] = 120 and 100 GeV for the J/ψ and ψ(2S), respectively, when integrated over the interval |y| < 1.2. The ratio of the ψ(2S) to J/ψ cross sections is also reported for |y| < 1.2, over the range 10 < p[subscript T] < 100  GeV. These are the highest p[subscript T] values for which the cross sections and ratio have been measured.
Date issued
2015-05
URI
http://hdl.handle.net/1721.1/98502
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Measurement of J/ψ and ψ(2S) Prompt Double-Differential Cross Sections in pp Collisions at √s = 7 TeV.” Physical Review Letters 114, no. 19 (May 2015). © 2015 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114

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