Measurement of the prompt J / ψ and ψ ( 2 S ) polarizations in pp collisions at √ s = 7 TeV
Author(s)
The CMS Collaboration
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The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton-proton collisions at s=7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb-1. The prompt J/ψ and ψ(2S) polarization parameters λθ{symbol}, λφ, and λθ{symbol}φ, as well as the frame-invariant quantity λ~, are measured from the dimuon decay angular distributions in three different polarization frames. The J/ψ results are obtained in the transverse momentum range 14<pT<70 GeV, in the rapidity intervals |y|<0.6 and 0.6<|y|<1.2. The corresponding ψ(2S) results cover 14<pT<50 GeV and include a third rapidity bin, 1.2<|y|<1.5. No evidence of large polarizations is seen in these kinematic regions, which extend much beyond those previously explored. © 2013 CERN.
Date issued
2013Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher
Elsevier BV
Citation
Chatrchyan, S., et al. "Measurement of the Prompt J/? and ?(2s) Polarizations in Pp Collisions at S=7 Tev." Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 727 4-5 (2013): 381-402.
Version: Final published version