Parton intrinsic motion in inclusive particle production: unpolarized cross sections, single spin asymmetries, and the Sivers effect
Parton intrinsic motion in inclusive particle production: unpolarized cross sections, single spin asymmetries, and the Sivers effect
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DOI：
10.1103/physrevd.70.074009
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发表时间：
2004-08
影响因子：
5
通讯作者：
U. D’Alesio;F. Murgia
中科院分区：
文献类型：
--
作者：
U. D’Alesio;F. Murgia
从Drell-Yan过程和双光子过程开始，到强子碰撞中光子和介子的产生，部分子的内禀（或原始）横动量在高能和中等大p {T}$粒子的产生中的相关性已经被人们认识了很长时间。鉴于它的极化过程和单自旋不对称的背景下，我们执行的新的兴趣，在微扰QCD的框架内，包括自旋和${\mathbit{k}}_{\ensuremath{\perp}}$的影响，在不同的运动学情况下的几个这样的过程进行了详细的分析。我们表明，包括这些影响导致，在这种方法中达到的精度水平，理论预测和实验非极化数据之间的总体令人满意的协议，从而支持在同一计划内的自旋效应和单自旋不对称性的研究。我们目前的结果横向单自旋不对称性，所产生的所谓的西弗斯效应，在包容性π介子和光子生产质子-质子碰撞。我们比较我们的结果与现有的实验数据和以前的结果使用这种方法的简化版本。
The relevance of intrinsic (or primordial) transverse momentum of partons in the inclusive production of particles at high energy and moderately large ${p}_{T}$ has been known for a long time, beginning with Drell-Yan and diphoton processes, and continuing with photon and meson production in hadronic collisions. In view of its renewed interest in the context of polarized processes and single spin asymmetries we perform, in the framework of perturbative QCD with the inclusion of spin and ${\mathbit{k}}_{\ensuremath{\perp}}$ effects, a detailed analysis of several such processes in different kinematical situations. We show that the inclusion of these effects leads, at the level of accuracy reachable in this approach, to an overall satisfactory agreement between theoretical predictions and experimental unpolarized data, thus giving support to the study of spin effects and single spin asymmetries within the same scheme. We present results for transverse single spin asymmetries, generated by the so-called Sivers effect, in inclusive pion and photon production in proton-proton collisions. We compare our results with the available experimental data and with previous results obtained using simplified versions of this approach.