Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in pp Collisions at √s=7 TeV
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Chatrchyan-2013-Measurement of the Upsilon.pdf
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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
Date Issued
February 2013
Journal
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
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.081802
