Polarization transfer in hyperon decays and its effect in relativistic nuclear collisions

Polarization transfer in hyperon decays and its effect in relativistic nuclear collisions
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超子衰变中的极化转移及其对相对论核碰撞的影响

DOI:
10.1140/epjc/s10052-019-7213-6
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发表时间:
2019-05
期刊:
The European Physical Journal C
影响因子:
--
通讯作者:
Enrico Speranza
Enrico Speranza
中科院分区:
其他
文献类型:
--
作者:
Francesco Becattini;Gaoqing Cao;Enrico Speranza

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我们计算对极化的贡献。高能相对论性核碰撞中的超子。(1385)和0,这是主要的。生产来源除了主要组成部分,。作为动量的函数。特别是,我们估计。作为函数的平均自旋矢量的纵向分量。横切面上的方位角,假设。初选。*和0极化符合预测。在相对论性流体中局部热力学平衡的条件下,速度依赖于中速。偏振可以忽略不计,我们发现这个分量。整体的自旋矢量与初始矢量有非常相似的模式。因此,我们得出结论,次级衰变不能。解释实验之间的符号差异。数据和水动力模型的纵向预测。最近由STAR测量的超子偏振。RHIC的实验。
We calculate the contribution to the polarization.ofhyperons in relativistic nuclear collisions at high energy.from the decays of.∗.(1385) and0,which are the predominant.sources ofproduction besides the primary component,.as a function of the momentum. Particularly, we estimate.the longitudinal component of themean spin vector as a function.of the azimuthal angle in the transverse plane, assuming.that primary .∗ and 0 polarization follow the predictions.of local thermodynamic equilibrium in a relativistic fluid..Provided that the rapidity dependence around midrapidity of.polarization is negligible, we find that this component of the.overall spin vector has a very similar pattern to the primary.one. Therefore, we conclude that the secondary decays cannot.account for the discrepancy in sign between experimental.data and hydrodynamic model predictions of the longitudinal.polarization of hyperons recently measured by the STAR.experiment at RHIC.
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