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

Physics Letters B. 2016. Vol. 761. P. 31–52.
Khachatryan V., Ratnikov F.

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 . 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.

Language: English
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Keywords: physicsCMSQuarkonium production
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