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

CMS Collaboration

doi:10.1016/j.physletb.2016.07.065

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

CMS Collaboration

Research output: Contribution to journal › Article › Research › peer-review

7 Citations (Scopus)

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 4.9fb⁻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.

Original language	English
Pages (from-to)	31-52
Number of pages	22
Journal	Physics Letters B
Volume	761
DOIs	https://doi.org/10.1016/j.physletb.2016.07.065
Publication status	Published - 2016
Externally published	Yes

Keywords

CMS
Physics
Quarkonium production
Quarkonium polarization
QCD medium effects

Access to Document

10.1016/j.physletb.2016.07.065

193813483-oaFinal published version, 791 KBLicence: CC BY

Cite this

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title = "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 4.9fb−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.",

keywords = "CMS, Physics, Quarkonium production, Quarkonium polarization, QCD medium effects",

author = "J Nash and {CMS Collaboration}",

year = "2016",

doi = "10.1016/j.physletb.2016.07.065",

language = "English",

volume = "761",

pages = "31--52",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - ϒ(nS) polarizations versus particle multiplicity in pp collisions at √s = 7 TeV

AU - Nash, J

AU - CMS Collaboration

PY - 2016

Y1 - 2016

N2 - 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 4.9fb−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.

AB - 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 4.9fb−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.

KW - CMS

KW - Physics

KW - Quarkonium production

KW - Quarkonium polarization

KW - QCD medium effects

U2 - 10.1016/j.physletb.2016.07.065

DO - 10.1016/j.physletb.2016.07.065

M3 - Article

VL - 761

SP - 31

EP - 52

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -