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

CDF Collaboration, A. Abulencia, J. Adelman, T. Affolder, T. Akimoto, M. G. Albrow, et al. (2007). Polarization of J/psi and psi(2S) Mesons Produced in p anti-p Collisions at s**(1/2) = 1.96 TeV. PHYSICAL REVIEW LETTERS, 99(13), 1-7 [10.1103/PhysRevLett.99.132001].

Polarization of J/psi and psi(2S) Mesons Produced in p anti-p Collisions at s**(1/2) = 1.96 TeV

CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MARGAROLI, FABRIZIO;MOGGI, NICCOLO';RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2007

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
CDF Collaboration, A. Abulencia, J. Adelman, T. Affolder, T. Akimoto, M. G. Albrow, et al. (2007). Polarization of J/psi and psi(2S) Mesons Produced in p anti-p Collisions at s**(1/2) = 1.96 TeV. PHYSICAL REVIEW LETTERS, 99(13), 1-7 [10.1103/PhysRevLett.99.132001].
CDF Collaboration; A. Abulencia; J. Adelman; T. Affolder; T. Akimoto; M. G. Albrow; S. Amerio; D. Amidei; A. Anastassov; K. Anikeev; A. Annovi; J. Ant...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/53693
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