Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8185443 | Nuclear Physics B - Proceedings Supplements | 2013 | 4 Pages |
Abstract
The polarizations of the Ï(1S), Ï(2S) and Ï(3S) mesons produced in proton-proton collisions at s=7TeV are measured using a data sample collected with the CMS detector in 2011. The data correspond to an integrated luminosity of 4.9fbâ1. The measurements are based on the analysis of the dimuon decay angular distributions, analyzed in three different polarization frames, and are presented as a function of the Ï transverse momentum in two rapidity ranges. The measurement of the polarization parameters, λθ,Î»Ï and λθÏ, is complemented by the determination of the frame-invariant quantity λ¯, which provides a useful intrinsic test of the reliability of the whole analysis chain as well as supplementary physical information. The polarizations of the three Ï states are found to be small in the considered kinematic region (10
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Ilse Krätschmer, CMS Collaboration CMS Collaboration,