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Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at sqrt(s) = 7 TeV

Abstract : The polarizations of prompt J/psi and psi(2S) mesons are measured in proton-proton collisions at sqrt(s) = 7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 inverse femtobarns. The prompt J/psi and psi(2S) polarization parameters lambda[theta], lambda[phi], and lambda[theta,phi], as well as the frame-invariant quantity lambda, are measured from the dimuon decay angular distributions in three different polarization frames. The J/spi results are obtained in the transverse momentum range 14 < pt < 70 GeV, in the rapidity intervals abs(y) < 0.6 and 0.6 < abs(y) < 1.2. The corresponding psi(2S) results cover 14 < pt < 50 GeV and include a third rapidity bin, 1.2 < abs(y) < 1.5. No evidence of large transverse or longitudinal polarizations is seen in these kinematic regions, which extend much beyond those previously explored.
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http://hal.in2p3.fr/in2p3-00847615
Contributor : Sylvie Flores Connect in order to contact the contributor
Submitted on : Wednesday, July 24, 2013 - 7:29:30 AM
Last modification on : Thursday, October 21, 2021 - 3:56:05 PM

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S. Chatrchyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, Elsevier, 2013, 727, pp.381-402. ⟨10.1016/j.physletb.2013.10.055⟩. ⟨in2p3-00847615⟩

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