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Polarizations of J/psi and psi(2S) mesons produced in pp collisions at square root s = 1.96 TeV |
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| Authors: | Abulencia A Adelman J Affolder T Akimoto T Albrow M G 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 E Barnett B A Baroiant S Bartsch V Bauer G Beauchemin P-H Bedeschi F Behari S Bellettini G Bellinger J Belloni A Benjamin D Beretvas A Beringer J Berry T Bhatti A Binkley M Bisello D Bizjak I Blair R E Blocker C Blumenfeld B Bocci A Bodek A Boisvert V Bolla G Bolshov A Bortoletto D Boudreau J Boveia A Brau B Brigliadori L |
| Affiliation: | University of Illinois, Urbana, Illinois 61801, USA. |
| 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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