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论文题目:	Remaining parts of the long-standing J/psi polarization puzzle
论文题目英文:
作者:	Feng, Yu; Gong, Bin; Chang, Chao-Hsi; Wang, Jian-Xiong
论文出处:
刊物名称:	PHYSICAL REVIEW D
年:	2019
卷:	99
期:	1
页:	14044
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摘要:	Based on the nonrelativistic quantum chromodynamics factorization formalism, the polarization parameters lambda(theta phi) and lambda(phi) of prompt J/psi hadroproduction for CMS and LHCb are analyzed in the helicity frame and calculated at QCD next-to-leading order for the first time. For prompt J/psi production, we take into account the feed-down contributions from chi(cJ) and psi(2S) decays. The theoretical predictions for the polarization parameters lambda(theta phi) and of J/psi are presented. Using the theoretical results, we perform a simultaneous fit to the experimental measurements of the yield and polarization of J/psi hadroproduction, and find that the results describe the experimental measurements at the LHC quite well.
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