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arXiv 0709.1087hep-ph
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LHC上喷流超子产生的自旋不对称性

Spin asymmetries in jet-hyperon production at LHC

D. Boer, C. J. Bomhof, D. S. Hwang, P. J. Mulders

摘要:

在LHC实验的运动学区域,特别是在ALICE实验中,考虑质子-质子散射p p ->(Λ^ \uparrow喷流)喷流X中极化λ超子的产生.我们提出了一个新的Lambda偏振观察到的Sivers效应的碎片化过程中产生的。即使在中快度时,它也可能很大,因此对于高能强子对撞机实验来说很有意义。除了它的潜力,揭示在非极化强子碰撞中产生的Lambda极化现象背后的机制,新的观察原则上也允许测试可能的色流依赖的单自旋不对称性和(非)横向动量依赖的碎片功能的普遍性。

英文摘要:

We consider polarized Lambda hyperon production in proton-proton scattering, p p -> (Λ^\uparrow jet) jet X, in the kinematical region of the LHC experiments, in particular the ALICE experiment. We present a new Lambda polarization observable that arises from the Sivers effect in the fragmentation process. It can be large even at midrapidity and therefore, is of interest for high energy hadron collider experiments. Apart from its potential to shed light on the mechanisms behind the phenomenon of Lambda polarization arising in unpolarized hadronic collisions, the new observable in principle also allows to test the possible color flow dependence of single spin asymmetries and the (non)universality of transverse momentum dependent fragmentation functions.

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