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arXiv 0911.4388hep-ex
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用STAR探测器测量正向区的横向自旋效应

Measurements of transverse spin effects in the forward region with the STAR detector

L. Nogach

摘要:

由STAR合作测量的横截面和横向单自旋不对称性(SSA)的中性π介子生产在大费曼x(x_F)在\sqrt{s} =200 GeV的pp碰撞以前的报告。非对称性对x_F的依赖关系可以用唯象模型来描述,这些唯象模型包括初态和终态中的Sivers效应、Collins效应或更高的扭曲贡献。要区分西弗斯效应和柯林斯效应,需要超越包含π^0的测量。对于2008年的运行,STAR的前向量热法显著延长。前向介子谱仪(FMS)的广泛接受使我们能够观察更重的介子态和π^0-π^0关联。将讨论最近的结果、当前分析的状况和近期计划。

英文摘要:

Measurements by the STAR collaboration of the cross section and transverse single spin asymmetry (SSA) of neutral pion production at large Feynman x (x_F) in pp-collisions at \sqrt{s}=200 GeV were reported previously. The x_F dependence of the asymmetry can be described by phenomenological models that include the Sivers effect, Collins effect or higher twist contributions in the initial and final states. Discriminating between the Sivers and Collins effects requires one to go beyond inclusive π^0 measurements. For the 2008 run, forward calorimetry at STAR was significantly extended. The large acceptance of the Forward Meson Spectrometer (FMS) allows us to look at heavier meson states and π^0-π^0 correlations. Recent results, the status of current analyses and near-term plans will be discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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