ϒ(nS) polarizations versus particle multiplicity in pp collisions at √ s = 7 TeV
Name
1-s2.0-S0370269316304063-main.pdf
Description
Published version
Size
911.79 KB
Format
Adobe PDF
Checksum (MD5)
f5d5c21a7b896a3b50bcd6d7f0d96444
Author(s)
CMS Collaboration
Date Issued
October 2016
Journal
Physics letters B
Publisher
Elsevier BV
Citation
CMS Collaboration (Khachatryan, V., et al.), "ϒ(nS) polarizations versus particle multiplicity in pp collisions at √ s = 7 TeV." Physics letters B 761, 761 (October 2016): p. 31-52 doi 10.1016/J.PHYSLETB.2016.07.065 ©2016 Author(s)
Version
Final published version
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. ©2016
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2016.07.065
