Measurement of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) Polarizations in pp Collisions at root s 7 TeV
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Author(s)
Type
Journal Article
Abstract
The polarizations of the ð1SÞ, ð2SÞ, and ð3SÞ mesons are measured in proton-proton collisions at ffiffi
s p ¼ 7 TeV, using a data sample of ðnSÞ ! þ decays collected by the CMS experiment,
corresponding to an integrated luminosity of 4:9 fb 1. The dimuon decay angular distributions are
analyzed in three different polarization frames. The polarization parameters #, ’, and #’, as well
as the frame-invariant quantity ~, are presented as a function of the ðnSÞ transverse momentum between
10 and 50 GeV, in the rapidity ranges jyj < 0:6 and 0:6 < jyj < 1:2. No evidence of large transverse or
longitudinal polarizations is seen in the explored kinematic region.
DO
s p ¼ 7 TeV, using a data sample of ðnSÞ ! þ decays collected by the CMS experiment,
corresponding to an integrated luminosity of 4:9 fb 1. The dimuon decay angular distributions are
analyzed in three different polarization frames. The polarization parameters #, ’, and #’, as well
as the frame-invariant quantity ~, are presented as a function of the ðnSÞ transverse momentum between
10 and 50 GeV, in the rapidity ranges jyj < 0:6 and 0:6 < jyj < 1:2. No evidence of large transverse or
longitudinal polarizations is seen in the explored kinematic region.
DO
Date Issued
2013-02-20
Date Acceptance
2012-09-13
Citation
Physical Review Letters, 2013, 110 (8)
ISSN
1079-7114
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
110
Issue
8
Copyright Statement
© 2013 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of
the Creative Commons Attribution 3.0 License. Further distribution
of this work must maintain attribution to the author(s) and
the published article’s title, journal citation, and DOI.
the Creative Commons Attribution 3.0 License. Further distribution
of this work must maintain attribution to the author(s) and
the published article’s title, journal citation, and DOI.
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Subjects
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
PHYSICS, MULTIDISCIPLINARY
HEAVY QUARKONIUM
Publication Status
Published
Article Number
081802