The polarizations of the ϒ(1S), ϒ(2S), and ϒ(3S) mesons are measured as a function of the charged particle multiplicity in proton–proton collisions at 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 fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS) transverse momentum (10–15 and 15–35 GeV), and in the rapidity interval |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 ϒ(2S) and ϒ(3S) cases.

Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV. PHYSICS LETTERS. SECTION B, 761, 31-52 [10.1016/j.physletb.2016.07.065].

ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV

BRIANZA, LUCA;DINARDO, MAURO EMANUELE;FIORENDI, SARA;GENNAI, STEFANO;GEROSA, RAFFAELE ANGELO;GHEZZI, ALESSIO;GOVONI, PIETRO;MANZONI, RICCARDO ANDREA;MARZOCCHI, BADDER;MORONI, LUIGI;PAGANONI, MARCO;RAGAZZI, STEFANO;TABARELLI DE FATIS, TOMMASO;De Guio, F;Lucchini, M;
2016

Abstract

The polarizations of the ϒ(1S), ϒ(2S), and ϒ(3S) mesons are measured as a function of the charged particle multiplicity in proton–proton collisions at 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 fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS) transverse momentum (10–15 and 15–35 GeV), and in the rapidity interval |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 ϒ(2S) and ϒ(3S) cases.
Articolo in rivista - Articolo scientifico
CMS; Physics; QCD medium effects; Quarkonium polarization; Quarkonium production;
CMS; Physics; QCD medium effects; Quarkonium polarization; Quarkonium production; Nuclear and High Energy Physics
English
2016
761
31
52
none
Khachatryan, V., Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., et al. (2016). ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV. PHYSICS LETTERS. SECTION B, 761, 31-52 [10.1016/j.physletb.2016.07.065].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/140779
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