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Abulencia, A.; Budd, S.; Ciobanu, C. I.; Errede, D.; Errede, S.; Gerberich, H.; Grundler, U.; Junk, T. R.; Kraus, J.; Marino, C. P.; Pitts, K.; Rogers, E.; Taffard, A.; Veramendi, G.; Zhang, X.; Adelman, J.; Attal, A.; Brubaker, E.; Fedorko, W. T.; Furic, I.
Physical review letters, 09/2007, Letnik: 99, Številka: 13Journal Article
We have measured the polarizations of J/{psi} and {psi}(2S) mesons as functions of their transverse momentum p{sub T} when they are produced promptly in the rapidity range |y|<0.6 with p{sub T}{>=}5 GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800 pb{sup -1} collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as p{sub T} 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/{psi} and {psi}(2S) mesons from B-hadron decays are also reported.
