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Polarizations of J/ψ and ψ(2S) Mesons Produced in pp Collisions at s√=1.96  TeV

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / Hamilton, Andrew / Lefevre, Régis / Moed, Shulamit / Sfyrla, Anna / Shreyber, Irina / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2007, vol. 99, no. 13, p. 132001
Abstract We have measured the polarizations of J/ψ and ψ(2S) mesons as functions of their transverse momentum pT when they are produced promptly in the rapidity range |y|<0.6 with pT≥5  GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800  pb−1 collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as pT increases from 5 to 30  GeV/c. These results are compared to the predictions of nonrelativistic quantum chromodynamics and other contemporary models. The effective polarizations of J/ψ and ψ(2S) mesons from B-hadron decays are also reported.
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CDF COLLABORATION. Polarizations of J/ψ and ψ(2S) Mesons Produced in pp Collisions at s√=1.96  TeV. In: Physical Review Letters, 2007, vol. 99, n° 13, p. 132001. https://archive-ouverte.unige.ch/unige:38400

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Deposited on : 2014-07-01

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