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

Abstract: The polarizations of the ?(1S), ?(2S), and ?(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 ?(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 ?(2S) and ?(3S) cases.

 Fuente: Physics Letters B, Vol.761, Pp. 31?52 (2016)

 Editorial: Elsevier

 Fecha de publicación: 01/10/2016

 Nº de páginas: 22

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2016.07.065

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2016.07.065

Autoría

KHACHATRYAN, VLADIMIR

JUAN RAMON CASTIÑEIRAS DE SAA

PABLO DE CASTRO MANZANO

MARCOS FERNANDEZ GARCIA

JUAN GARCIA FERRERO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

ANA YAIZA RODRIGUEZ MARRERO