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

CMS Collaboration

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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 languageEnglish
Pages (from-to)31-52
Number of pages22
JournalPhysics Letters B
Volume761
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • CMS
  • Physics
  • Quarkonium production
  • Quarkonium polarization
  • QCD medium effects

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