Global hyperon polarization at local thermodynamic equilibrium with vorticity, magnetic field, and feed-down

被引：233

作者：

Becattini, Francesco ^{[1
,2
]}

Karpenko, Iurii ^{[2
]}

Lisa, Michael Annan ^{[3
]}

Upsal, Isaac ^{[3
]}

Voloshin, Sergei A. ^{[4
]}

机构：

[1] Univ Florence, Dipartmento Fis, I-50019 Florence, Italy

[2] Ist Nazl Fis Nucl, Sez Firenze, I-50019 Florence, Italy

[3] Ohio State Univ, Phys Dept, Columbus, OH 43210 USA

[4] Wayne State Univ, Detroit, MI 48201 USA

来源：

PHYSICAL REVIEW C | 2017年 / 95卷 / 05期

基金：

美国国家科学基金会;

关键词：

NUCLEAR COLLISIONS; LAMBDA; SPIN; GAS;

D O I：

10.1103/PhysRevC.95.054902

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The system created in ultrarelativistic nuclear collisions is known to behave as an almost ideal liquid. In noncentral collisions, because of the large orbital momentum, such a system might be the fluid with the highest vorticity ever created under laboratory conditions. Particles emerging from such a highly vorticous fluid are expected to be globally polarized with their spins on average pointing along the system angular momentum. Vorticity-induced polarization is the same for particles and antiparticles, but the intense magnetic field generated in these collisions may lead to the splitting in polarization. In this paper we outline the thermal approach to the calculation of the global polarization phenomenon for particles with spin and we discuss the details of the experimental study of this phenomenon, estimating the effect of feed-down. A general formula is derived for the polarization transfer in two-body decays and, particularly, for strong and electromagnetic decays. We find that accounting for such effects is crucial when extracting vorticity and magnetic field from the experimental data.

引用

页数：13

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