Single Spin Asymmetry Scaling in the Forward Rapidity Region at RHIC
Single Spin Asymmetry Scaling in the Forward Rapidity Region at RHIC
复制标题
RHIC 前向快速区域的单自旋不对称尺度
DOI：
10.1103/physrevd.84.034019
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发表时间：
2011
影响因子：
5
通讯作者：
F. Yuan
中科院分区：
文献类型：
--
作者：
Z. Kang;F. Yuan
研究了包涵强子产生的标度特性和在RHIC正快区产生的单横向自旋不对称性。我们发现pp和dAu碰撞的自旋平均实验数据都表现出横向动量依赖的几何标度。我们引入横向动量相关的柯林斯碎片函数来研究单横向自旋不对称的标度。标度分析的总体特征与实验观测一致，特别是在RHIC能量下自旋不对称的横向动量依赖。我们进一步提出通过测量低横动量下pp散射的自旋不对称性来探测原子核的饱和尺度。
We investigate the scaling properties in inclusive hadron production and the associated single transverse spin asymmetry in the forward rapidity region at RHIC. We find that the spin-averaged experimental data in both pp and dAu collisions demonstrates a transverse-momentum-dependent geometric scaling. We introduce the transverse-momentum-dependent Collins fragmentation function to study the scaling of the single transverse spin asymmetries. The general feature of the scaling analysis is consistent with the experimental observations, in particular, for the transverse momentum dependence of the spin asymmetries at RHIC energy. We further propose to probe the saturation scale of nuclei by measuring the spin asymmetry normalized by that in pp scattering at low transverse momentum.