Single-spin asymmetry of J/ψ production in <i>p</i> plus <i>p</i>, <i>p</i> plus Al, and <i>p</i> plus Au collisions with transversely polarized proton beams at √s<sub>NN</sub>=200 GeV


Aidala C., Akiba Y., Alfred M., Andrieux V., Apadula N., Asano H., ...Daha Fazla

PHYSICAL REVIEW D, cilt.98, sa.1, 2018 (SCI-Expanded, Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 98 Sayı: 1
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1103/physrevd.98.012006
  • Dergi Adı: PHYSICAL REVIEW D
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

We report the transverse single-spin asymmetries of J/psi production at forward and backward rapidity, 1.2 < vertical bar y vertical bar < 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 thorn Al, and p thorn Au collisions with transversely polarized proton beams at root s(NN) p = 200 GeV. At this collision energy, single-spin asymmetries for heavy-flavor particle production of p thorn 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 thorn 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 thorn 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 thorn Au data for p(T) < 2 GeV= c at both forward and backward rapidity, while in p thorn Al collisions the asymmetries are consistent with zero within the range of experimental uncertainties.