Single-spin asymmetry of J/ψ production in p+p, p+Al, and p+Au collisions with transversely polarized proton beams at √sNN=200  GeV

Aidala, C. and Makek, Mihael and Vukman, Nikola and Zou, L. (PHENIX Collaboration) (2018) Single-spin asymmetry of J/ψ production in p+p, p+Al, and p+Au collisions with transversely polarized proton beams at √sNN=200  GeV. Physical Review D, 98 (1). pp. 12006-11. ISSN 1550-7998

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Abstract

We report the transverse single-spin asymmetries of J/ψ production at forward and backward rapidity, 1.2<|y|<2.2, as a function of J/ψtransverse momentum (pT) and Feynman-x (xF). 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 √sNN=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 a positive asymmetry at the two-standard-deviation level in the p+p data for 2  GeV/c<pT<10  GeV/c at backward rapidity and negative asymmetries at the two-standard-deviation level in the p+Au data for pT<2  GeV/c at both forward and backward rapidity, while in p+Alcollisions the asymmetries are consistent with zero within the range of experimental uncertainties.

Item Type: Article
Date: 2018
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2018 American Physical Society. Received 7 May 2018; published 30 July 2018.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 Sep 2018 08:22
Last Modified: 12 Sep 2018 08:22
URI: http://digre.pmf.unizg.hr/id/eprint/5857

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