# Y(nS) polarizations versus particle multiplicity in pp collisions at sqrt(s) = 7 TeV

Abstract : The polarizations of the Y(1S), Y(2S), and Y(3S) mesons are measured as a function of the charged particle multiplicity in proton-proton collisions at sqrt(s) = 7 TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9 inverse femtobarns. The results are extracted from the dimuon decay angular distributions, in two ranges of Y(nS) transverse momentum (10-15 and 15-35 GeV), and in the rapidity interval abs(y)<1.2. The results do not show significant changes from low- to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the Y(2S) and Y(3S) cases.
Type de document :
Article dans une revue
Physics Letters B, Elsevier, 2016, 761, pp.31-52. 〈10.1016/j.physletb.2016.07.065〉

http://hal.in2p3.fr/in2p3-01285920
Contributeur : Sylvie Flores <>
Soumis le : jeudi 10 mars 2016 - 07:01:56
Dernière modification le : jeudi 10 mai 2018 - 02:00:28

### Citation

V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Y(nS) polarizations versus particle multiplicity in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, Elsevier, 2016, 761, pp.31-52. 〈10.1016/j.physletb.2016.07.065〉. 〈in2p3-01285920〉

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