Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at s=7 TeV
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol.727, no.4-5, pp.381-402, 2013 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 727 Issue: 4-5
- Publication Date: 2013
- Doi Number: 10.1016/j.physletb.2013.10.055
- Journal Name: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.381-402
- Keywords: CMS, Physics, Quarkonium polarization, Quarkonium production
- Yıldız Technical University Affiliated: Yes
Abstract
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