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Angular decay coefficients of $$J/psi$$ mesons at forward rapidity from $$p+p$$ collisions at $$sqrt{s}=510$$ GeV

$$sqrt{s}$$=510GeVでの陽子-陽子衝突における前方$$J/psi$$の崩壊角

Adare, A.*; 長谷川 勝一   ; 今井 憲一; 永宮 正治; 佐甲 博之   ; 佐藤 進  ; 谷田 聖   ; PHENIX Collaboration*; 他389名*

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 $$p$$$$+$$$$p$$ collisions at $$sqrt{s}=510$$ GeV. The measurements are made for $$J/psi$$ transverse momentum $$2 < p_{T} < 10$$ 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 $$lambda_{theta}$$ 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 $$tilde{lambda}$$ is strongly negative at all $$p_{T}$$ in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.

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パーセンタイル:13.82

分野:Astronomy & Astrophysics

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