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. 2007 Sep 28;99(13):132001.
doi: 10.1103/PhysRevLett.99.132001. Epub 2007 Sep 26.

Polarizations of J/psi and psi(2S) mesons produced in pp collisions at square root s = 1.96 TeV

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Affiliations

Polarizations of J/psi and psi(2S) mesons produced in pp collisions at square root s = 1.96 TeV

A Abulencia et al. Phys Rev Lett. .

Abstract

We have measured the polarizations of J/psi and psi(2S) mesons as functions of their transverse momentum p(T) when they are produced promptly in the rapidity range |y| < 0.6 with p(T) > or =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 p(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.

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