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)>= 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.

A., A., J., A., T., A., T., A., M. G., A., S., A., et al. (2007). Polarizations of J/psi and psi(2S) mesons produced in p(p)over-bar collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 99(13), 132001-1-132001-7 [10.1103/PhysRevLett.99.132001].

Polarizations of J/psi and psi(2S) mesons produced in p(p)over-bar collisions at root s=1.96 TeV

CIOCCI, MARIA AGNESE;
2007-01-01

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)>= 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.
2007
A., A., J., A., T., A., T., A., M. G., A., S., A., et al. (2007). Polarizations of J/psi and psi(2S) mesons produced in p(p)over-bar collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 99(13), 132001-1-132001-7 [10.1103/PhysRevLett.99.132001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/36261
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