Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at 200 GeV
Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at 200 GeV
复制标题
200 GeV 偏振质子碰撞中包含射流和双射流产生的纵向双自旋不对称性
DOI：
10.1103/physrevd.103.l091103
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发表时间：
2021
影响因子：
5
通讯作者：
STAR Collaboration
中科院分区：
文献类型：
--
作者：
Abdallah M.S.;Esumi S. 他;STAR Collaboration
本文报道了在质心能量为的极化碰撞中，对包含中快度的喷流和双喷流产生的纵向双自旋不对称性的高精度测量。新的包含喷流数据对胶子螺旋度分布敏感，胶子动量分数在~范围内，而新的双喷流数据对胶子螺旋度分布的依赖性提供了进一步的限制。的结果是在良好的协议与以前的测量和最近的理论评估先前的世界数据。我们的新结果有更好的精确度，从而加强了对。
We report high-precision measurements of the longitudinal double-spin asymmetry,, for midrapidity inclusive jet and dijet production in polarizedcollisions at a center-of-mass energy of. The new inclusive jet data are sensitive to the gluon helicity distribution,, for gluon momentum fractions in the range fromto, while the new dijet data provide further constraints on thedependence of. The results are in good agreement with previous measurements atand with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence thatis positive for.