Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in pp Collisions at √s=7 TeV
Author(s)
Apyan, Aram; Bauer, Gerry P.; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, V.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Kim, Y.; Klute, Markus; Krajczar, Krisztian F.; Levin, A.; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Rudolph, M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, R.; Wyslouch, Boleslaw; Yang, M.; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Zhukova, Victoria; ... Show more Show less
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The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at √s=7 TeV, using a data sample of Υ(nS)→μ[superscript +]μ[superscript -] decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb[superscript -1]. The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λ[subscript ϑ], λ[subscript φ], and λ[subscript ϑφ], as well as the frame-invariant quantity λ˜, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges |y|<0.6 and 0.6<|y|<1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region.
Date issued
2013-02Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, et al. Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in Pp Collisions at Sqrt[s]=7 TeV. Physical Review Letters 110(8), 2013. © 2013 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114