Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/8774
Title: Upsilon (nS) polarizations versus particle multiplicity in pp collisions at root s=7 TeV
Authors: Karapınar, Güler
CMS Collaboration
Keywords: CMS
Physics
Quarkonium production
Quarkonium polarization
QCD medium effects
Issue Date: 2016
Publisher: Elsevier Ltd.
Abstract: The polarizations of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) mesons are measured as a function of the charged particle multiplicity in proton-proton collisions at root 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 4.9fb(-1). The results are extracted from the dimuon decay angular distributions, in two ranges of Upsilon(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 Upsilon(2S) and Upsilon(3S) cases. (C) 2016 The Author(s). Published by Elsevier B.V.
URI: https://doi.org/10.1016/j.physletb.2016.07.065
https://hdl.handle.net/11147/8774
ISSN: 0370-2693
Appears in Collections:Rectorate / Rektörlük
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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