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Title
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Upsilon (nS) polarizations versus particle multiplicity in pp collisions at root s=7 TeV
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Author
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Institution/Organisation
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CMS Collaboration
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Abstract
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| The polarizations of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) mesons are measured as a function of the charged particle multiplicity in proton-proton collisions at root 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 Upsilon(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 Upsilon(2S) and Upsilon(3S) cases. (C) 2016 The Author(s). Published by Elsevier B.V. |
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Language
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English
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Source (journal)
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Physics letters : B. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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2016
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ISSN
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0370-2693
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DOI
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10.1016/J.PHYSLETB.2016.07.065
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Volume/pages
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761
(2016)
, p. 31-52
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ISI
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000384469900006
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Full text (Publisher's DOI)
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Full text (open access)
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