AI Article Synopsis
- The study measures the polarizations of J/psi and psi(2S) mesons based on their transverse momentum, specifically between 5 and 30 GeV/c, in the rapidity range of |y| < 0.6.
- Results show that the polarizations trend towards becoming more longitudinal as transverse momentum increases.
- The findings are compared to existing predictions from nonrelativistic quantum chromodynamics and other modern theoretical models, and additional data on polarizations from B-hadron decays are also included.
Article 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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| http://dx.doi.org/10.1103/PhysRevLett.99.132001 | DOI Listing |
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