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Remaining parts of the long-standing J/ψ polarization puzzle

Authors :
Bin Gong
Yu Feng
Jian-Xiong Wang
Chao-Hsi Chang
Source :
Physical Review
Publication Year :
2019
Publisher :
American Physical Society (APS), 2019.

Abstract

Based on the nonrelativistic quantum chromodynamics factorization formalism, the polarization parameters λθϕ and λϕ of prompt J/ψ 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/ψ production, we take into account the feed-down contributions from χcJ and ψ(2S) decays. The theoretical predictions for the polarization parameters λθϕ and λϕ of J/ψ are presented. Using the theoretical results, we perform a simultaneous fit to the experimental measurements of the yield and polarization of J/ψ hadroproduction, and find that the results describe the experimental measurements at the LHC quite well.

Details

ISSN :
24700029 and 24700010
Volume :
99
Database :
OpenAIRE
Journal :
Physical Review D
Accession number :
edsair.doi.dedup.....1e2c43ab883347388f56b4cdd40cb6f8
Full Text :
https://doi.org/10.1103/physrevd.99.014044