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Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in pp Collisions at s√=7 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Kenny, R. P., III Murray, Michael J. Noonan, Danny Sanders, Stephen J. Stringer, Robert W. Tinti, Gemma Wood, Jeffrey Scott
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Kenny, R. P., III
Murray, Michael J.
Noonan, Danny
Sanders, Stephen J.
Stringer, Robert W.
Tinti, Gemma
Wood, Jeffrey Scott
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Abstract
The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at s√=7 TeV, using a data sample of Υ(nS)→μ(+)μ(−) decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb(−1). The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λ(ϑ), λ(φ), and λ(ϑφ), as well as the frame-invariant quantity λ˜, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges |y|<0.6 and 0.6<|y|<1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region.
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This is the publisher's version, also available electronically from http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.110.081802.
Date
2013-02-20
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American Physical Society
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Baringer_2-20-2013.pdf
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S. Chatrchyan et al. (CMS Collaboration). (2013). "Measurement of the Υ(1S), Υ(2S), and Υ(3S) Polarizations in pp Collisions at s√=7 TeV." Physical Review Letters, 110(8):081802. http://dx.doi.org/10.1103/PhysRevLett.110.081802.