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Angular decay coefficients of J/ψ mesons at forward rapidity from p+p collisions at √s = 510 GeV

Journal Article · · Physical Review. D.
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In this paper, we report the first measurement of the full angular distribution for inclusive J/ψ → μ+μ- decays in p+p collisions at √s = 510 GeV. The measurements are made for J/ψ transverse momentum 2 < pT < 10 GeV/c and rapidity 1.2 < y < 2.2 in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient λθ is strongly negative at low pT and becomes close to zero at high pT, while the azimuthal coefficient λΦ is close to zero at low pT, and becomes slightly negative at higher pT. The frame-independent coefficient λ~ is strongly negative at all pT in all frames. Finally, the data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.
Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
SC0012704
OSTI ID:
1354690
Alternate ID(s):
OSTI ID: 1378145
Report Number(s):
BNL--113789-2017-JA
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 95; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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