Polarizations of J/ψ and ψ(2S) mesons produced in pp̄ collisions at s=1.96TeV

Authors

A. Abulencia, University of Illinois Urbana-Champaign
J. Adelman, The Enrico Fermi Institute
T. Affolder, University of California, Santa Barbara
T. Akimoto, University of Tsukuba
M. G. Albrow, Fermi National Accelerator Laboratory
S. Amerio, Università degli Studi di Padova
D. Amidei, University of Michigan, Ann Arbor
A. Anastassov, Rutgers University–New Brunswick
K. Anikeev, Fermi National Accelerator Laboratory
A. Annovi, INFN, Laboratori Nazionali Di Frascati
J. Antos, Univerzita Komenského v Bratislave
M. Aoki, University of Tsukuba
G. Apollinari, Fermi National Accelerator Laboratory
T. Arisawa, Waseda University
A. Artikov, Joint Institute for Nuclear Research, Dubna
W. Ashmanskas, Fermi National Accelerator Laboratory
A. Attal, The Enrico Fermi Institute
A. Aurisano, University of Oxford
F. Azfar, University of Oxford
P. Azzi-Bacchetta, Università degli Studi di Padova
P. Azzurri, Scuola Normale Superiore di Pisa
N. Bacchetta, Università degli Studi di Padova
W. Badgett, Fermi National Accelerator Laboratory
A. Barbaro-Galtieri, Lawrence Berkeley National Laboratory
V. E. Barnes, Purdue University
B. A. Barnett, Johns Hopkins University
S. Baroiant, University of California, Davis
V. Bartsch, University College London

Document Type

Article

Publication Date

9-26-2007

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 5GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800pb-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 30GeV/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. © 2007 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

Recommended Citation

Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., Azzi-Bacchetta, P., Azzurri, P., Bacchetta, N., Badgett, W., Barbaro-Galtieri, A., Barnes, V., Barnett, B., Baroiant, S., & Bartsch, V. (2007). Polarizations of J/ψ and ψ(2S) mesons produced in pp̄ collisions at s=1.96TeV. Physical Review Letters, 99 (13) https://doi.org/10.1103/PhysRevLett.99.132001