TY - JOUR
T1 - ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV
AU - CMS Collaboration
AU - Khachatryan, V.
AU - Sirunyan, A. M.
AU - Tumasyan, A.
AU - Adam, W.
AU - Asilar, E.
AU - Bergauer, T.
AU - Brandstetter, J.
AU - Brondolin, E.
AU - Dragicevic, M.
AU - Erö, J.
AU - Fabjan, C.
AU - Flechl, M.
AU - Friedl, M.
AU - Frühwirth, R.
AU - Ghete, V. M.
AU - Hartl, C.
AU - Hörmann, N.
AU - Hrubec, J.
AU - Jeitler, M.
AU - Knünz, V.
AU - König, A.
AU - Krammer, M.
AU - Krätschmer, I.
AU - Liko, D.
AU - Matsushita, T.
AU - Mikulec, I.
AU - Rabady, D.
AU - Rad, N.
AU - Rahbaran, B.
AU - Rohringer, H.
AU - Schieck, J.
AU - Schöfbeck, R.
AU - Strauss, J.
AU - Treberer-Treberspurg, W.
AU - Waltenberger, W.
AU - Wulz, C. E.
AU - Mossolov, V.
AU - Shumeiko, N.
AU - Suarez Gonzalez, J.
AU - Zghiche, A.
AU - Beaudette, F.
AU - Charlot, C.
AU - Granierde Cassagnac, R.
AU - Nguyen, M.
AU - Ochando, C.
AU - Paganini, P.
AU - Salerno, R.
AU - Sauvan, J. B.
AU - Sirois, Y.
AU - Zabi, A.
N1 - Publisher Copyright:
© 2016 The Author(s)
PY - 2016/10/10
Y1 - 2016/10/10
N2 - 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 4.9 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.
AB - 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 4.9 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.
KW - CMS
KW - Physics
KW - QCD medium effects
KW - Quarkonium polarization
KW - Quarkonium production
U2 - 10.1016/j.physletb.2016.07.065
DO - 10.1016/j.physletb.2016.07.065
M3 - Article
AN - SCOPUS:84982307188
SN - 0370-2693
VL - 761
SP - 31
EP - 52
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ER -