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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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 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