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.

(2016). ϒ(nS) polarizations versus particle multiplicity in pp collisions at √s = 7 TeV [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/143474

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

V. Re;I. Vai;
2016-01-01

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
2016
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Fabjan, ...espandi
(2016). ϒ(nS) polarizations versus particle multiplicity in pp collisions at √s = 7 TeV [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/143474
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/143474
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