Journal
PHYSICAL REVIEW LETTERS
Volume 99, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.99.132001
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Funding
- Science and Technology Facilities Council [PP/E000444/1, PP/E000452/1, PPA/A/S/2003/00461/2] Funding Source: researchfish
- STFC [PP/E000452/1] Funding Source: UKRI
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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.
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