ϒ(nS) polarizations versus particle multiplicity in pp collisions at √s=7 TeV
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. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000119699Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Physics Letters BBand
Seiten / Artikelnummer
Verlag
ElsevierThema
CMS; Physics; Quarkonium production; Quarkonium polarization; QCD medium effectsOrganisationseinheit
03593 - Dissertori, Günther / Dissertori, Günther
03381 - Pauss, Felicitas (emeritus)
03904 - Wallny, Rainer / Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)