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論文

Single-spin asymmetry of $$J/psi$$ production in $$p$$$$+$$$$p$$, $$p$$$$+$$Al, and $$p$$$$+$$Au collisions with transversely polarized proton beams at $$sqrt{s_{_{NN}}}=200$$ GeV

Aidala, C.*; 長谷川 勝一; 今井 憲一; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他286名*

Physical Review D, 98(1), p.012006_1 - 012006_11, 2018/07

AA2018-0590.pdf:0.75MB

 被引用回数:10 パーセンタイル:54.62(Astronomy & Astrophysics)

We report the transverse single-spin asymmetries of $$J/psi$$ production at forward and backward rapidity, $$1.2<|y|<2.2$$, as a function of $$J/psi$$ transverse momentum ($$p_T$$) and Feynman-$$x$$ ($$x_F$$). The data analyzed were recorded by the PHENIX experiment at the Relativistic Heavy Ion Collider in 2015 from $$p$$$$+$$$$p$$, $$p$$$$+$$Al, and $$p$$$$+$$Au collisions with transversely polarized proton beams at $$sqrt{s_{_{NN}}}=200$$ GeV. At this collision energy, single-spin asymmetries for heavy-flavor particle production of $$p$$$$+$$$$p$$ collisions provide access to the spin-dependent gluon distribution and higher-twist correlation functions inside the nucleon, such as the gluon Qiu-Sterman and trigluon correlation functions. Proton + nucleus collisions offer an excellent opportunity to study nuclear effects on the correlation functions. The data indicate negative asymmetries at the two-standard-deviation level in the $$p$$$$+$$Au data for $$p_T<2$$ GeV/$$c$$ at both forward and backward rapidity, while in $$p$$$$+$$$$p$$ and $$p$$$$+$$Al collisions the asymmetries are consistent with zero within the range of experimental uncertainties.

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