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ϒ(nS)polarizations versus particle multiplicity in pp collisions at √s=7TeV
CMS Collaboration
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=7TeV. 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 15–35GeV), 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.
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2016-08-02
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Elsevier
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CMSCollab_2016.pdf
Adobe PDF, 911.79 KB
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Keywords
CMS, Physics, Quarkonium production, Quarkonium polarization, QCD medium effects
Citation
Khachatryan, V., Bansal, S., Hindrichs, O., Barnett, B. A., Ciocci, M. A., Weiler, T., ... & Canelli, M. F. (2016). ϒ (nS) polarizations versus particle multiplicity in pp collisions at s= 7 TeV. Physics letters B.