Angular decay coefficients of mesons at forward rapidity from collisions at GeV

Adare, A.*; Hasegawa, Shoichi ; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki ; Sato, Susumu ; Tanida, Kiyoshi ; PHENIX Collaboration*; 389 of others*

We report the first measurement of the full angular distribution for inclusive $J/psirightarrowmu^{+}mu^{-}$ decays in collisions at GeV. The measurements are made for transverse momentum $2 < p_{T} < 10$ GeV/ and rapidity in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient $lambda_{theta}$ is strongly negative at low $p_{T}$ and becomes close to zero at high $p_{T}$ , while the azimuthal coefficient $lambda_{phi}$ is close to zero at low $p_{T}$ , and becomes slightly negative at higher $p_{T}$ . The frame-independent coefficient is strongly negative at all $p_{T}$ in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.

Language	:	English
Journal	:	Physical Review D
Volume	:	95
Number	:	9
Pages	:	p.092003_1 - 092003_13
Publication Year/Month	:	2017/05
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PDF	:	AA2017-0100.pdf:0.69MB
Paper URL	:	https://doi.org/10.1103/PhysRevD.95.092003
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Keywords	:	no keyword
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Cooperating Institute	:	Brookhaven National Laboratory

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Registration No. : AA20170100
JAEA Abstracts No. : 45000762
Paper Submission No. : 19015

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