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arXiv 0906.4295hep-ph
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重离子和质子-质子碰撞中矢量介子的自旋排列

Spin alignment of vector mesons in heavy ion and proton - proton collisions

Alejandro Ayala, Eleazar Cuautle, G. Herrera Corral, J. Magnin, Luis Manuel Montano

摘要:

在中心快度RHIC中测量了矢量介子K^{*0}和φ(1020)的自旋取向矩阵元rho_{00}。这些测量结果与中间-中心Au + Au碰撞中反应平面没有极化一致,而当在相同反应和p + p碰撞中相对于产生平面测量时,一个非零的和p_perp-我们发现,这种行为可以在一个简单的矢量介子产生模型中理解,其中它们的组成夸克的自旋是在强子化过程中,由于托马斯岁差的结果。

英文摘要:

The spin alignment matrix element rho_{00} for the vector mesons K^{*0} and phi(1020) has been measured in RHIC at central rapidities. These measurements are consistent with the absence of polarization with respect to the reaction plane in mid-central Au + Au collisions whereas, when measured with respect to the production plane in the same reactions and in p + p collisions, a non-vanishing and p_perp-dependent rho_{00} is found. We show that this behavior can be understood in a simple model of vector meson production where the spin of their constituent quarks is oriented during hadronization as the result of Thomas precession.

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