Naslov
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

Autori
Aidala, C. ; ... ; Makek, Mihael ; ... ; Vukman, Nikola ; ... ; Zou, L.

Kolaboracija
PHENIX Collaboration

Izvornik
Physical review. D (2470-0010) 98 (2018), 1; 012006, 11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
asymmetry ; jpsi ; PHENIX

Sažetak
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/ψ transverse 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+Al collisions the asymmetries are consistent with zero within the range of experimental uncertainties.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA