论文标题
$ p^{\ uparrow} p \ to j/ψx$ process的单旋不对称的估计值
Estimates for the single-spin asymmetries in $p^{\uparrow}p \to J/ψX$ process at PHENIX RHIC and SPD NICA
论文作者
论文摘要
我们在$ p^{\ uparrow} p \ to j/ψx$反应中研究了横向单旋不对称（TSSA），均包含横向摩托和自旋效应。为了预测及时$ j/ψ$的生产横截面，我们使用两种不同的方法：非偏好的QCD（NRQCD）分解方法和改进的颜色蒸发模型（ICEM），并显示TSSA的预测结果如何取决于强发模型的选择。对于初始国家分解，我们考虑了两个模型：标准的广义Parton模型（GPM）和IT的颜色规数（CGI-GPM）。我们证明了在此过程中tssa上的phenix协作数据$ p^{\ uparrow} p \ to j/ψx$约束质子的gluon sivers函数，并排除了现有参数化之一。首次提出了未来SPD NICA实验条件的$ p^{\ uparrow} p \ to j/ψx$进程的tssas的估计。
We study the transverse single-spin asymmetry (TSSA) in $p^{\uparrow}p \to J/ψX$ reaction, incorporating both transverse-momentum and spin effects. To predict production cross section of prompt $J/ψ$ we use two different approaches, the non-relativistic QCD (NRQCD) factorization approach and the Improved Color Evaporation Model (ICEM), and show how the predicted results for TSSAs depend on choice of hadronization model. For initial-state factorization we consider two models: the standard Generalized Parton Model (GPM) and the Colour Gauge-Invariant version of it (CGI-GPM). We demonstrate that PHENIX collaboration data on TSSA in the process $p^{\uparrow}p \to J/ψX$ constrain the gluon Sivers function of the proton and rule-out one of existing parameterizations. Estimates for the TSSAs in $p^{\uparrow}p \to J/ψX$ process for the conditions of the future SPD NICA experiment are presented for the first time.
