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

Khachatryan,Am Sirunyan, A Tumasyan, W Adam,E Asilar,T Bergauer,J Brandstetter, E Brondolin,M Dragicevic,J Erö, C Fabjan, M Flechl,M Friedl,R Frühwirth,Vm Ghete,C Hartl, N Hörmann, J Hrubec,M Jeitler,Knünz, A König,M Krammer,I Krätschmer, D Liko,T Matsushita, I Mikulec, D Rabady,N Rad, B Rahbaran, H Rohringer,J Schieck,R Schöfbeck,J Strauss,W Treberer-Treberspurg,W Waltenberger,Ce Wulz, Mossolov, N Shumeiko,J Suarez Gonzalez, S Alderweireldt,T Cornelis,Ea De Wolf,X Janssen, A Knutsson, J Lauwers,S Luyckx,M Van De Klundert,H Van Haevermaet,P Van Mechelen,N Van Remortel,A Van Spilbeeck,S Abu Zeid,F Blekman,J D'Hondt, N Daci,I De Bruyn, K Deroover,N Heracleous,J Keaveney,S Lowette, L Moreels, A Olbrechts, Q Python, D Strom,S Tavernier,W Van Doninck,P Van Mulders,Gp Van Onsem,I Van Parijs,P Barria,H Brun, C Caillol,B Clerbaux,G De Lentdecker,W Fang,G Fasanella, L Favart,R Goldouzian, A Grebenyuk, G Karapostoli,T Lenzi,A Léonard, T Maerschalk,A Marinov, L Perniè,A Randle-conde,T Seva,C Vander Velde, P Vanlaer, R Yonamine, F Zenoni,F Zhang, K Beernaert,L Benucci,A Cimmino, S Crucy, D Dobur, A Fagot,G Garcia,M Gul

PHYSICS LETTERS B（2016）

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摘要

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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关键词

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

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