Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at =7 TeV
Type :
Article
Publication Status :
published
Access :
restrictedAccess
Abstract
The polarizations of prompt J/ψ and ψ(2S) mesons are measured in proton–proton collisions at View the MathML source, 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, λφ, and λϑφ, as well as the frame-invariant quantity View the MathML source, 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.
Source :
Physics Letters B
Date :
2013-12-18
Volume :
727
Issue :
4-5
Publisher :
Elsevier
URI
http://hdl.handle.net/10679/529http://www.sciencedirect.com/science/article/pii/S0370269313008629#
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