Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8187450 | Physics Letters B | 2013 | 22 Pages |
Abstract
The polarizations of prompt J/Ï and Ï(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 fbâ1. The prompt J/Ï and Ï(2S) polarization parameters λÏ, λÏ, and λÏÏ, as well as the frame-invariant quantity λË, are measured from the dimuon decay angular distributions in three different polarization frames. The J/Ï results are obtained in the transverse momentum range 14
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