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=7TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS)transverse momentum (10–15 and 15–35GeV), 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.
ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV
Sola, V.;AMAPANE, Nicola Carlo;ARCIDIACONO, Roberta;ARGIRO', Stefano;ARNEODO, Michele;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;FINCO, LINDA;KIANI, Muhammad Bilal Manzoor;MIGLIORE, Ernesto;MONACO, Vincenzo;MONTEIL, ENNIO;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;RUSPA, Marta;SACCHI, Roberto;SOLANO, Ada Maria;
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=7TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9fb−1. The results are extracted from the dimuon decay angular distributions, in two ranges of ϒ(nS)transverse momentum (10–15 and 15–35GeV), 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.File | Dimensione | Formato | |
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