Hadronic scattering effects on Λ polarization in relativistic heavy ion collisions

IF 4.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Haesom Sung , Che Ming Ko , Su Houng Lee
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引用次数: 0

Abstract

The Λ hyperon spin flip and non-flip cross sections are calculated in a simple hadronic model by including both the s-channel process involving the spin 3/2, positive parity Σ(1358) resonance and the t-channel process via the exchange of a scalar σ meson. Because of its large mass, the Λ spin flip to non-flip cross sections is negligibly small in the t-channel process compared to the constant value of 1/3.5 in the s-channel process. With the s-channel Λπ spin-dependent cross sections included in a schematic kinetic model, the effects of hadronic scatterings on the Λ spin polarization in Au-Au collisions at sNN=7.7 GeV are studied. It is found that the Λ spin polarization only decreases by 7-12% during the hadronic stage of these collisions, which justifies the assumption in theoretical studies that compare the Λ polarization calculated at the chemical freezeout to the measured one at the kinetic freezeout.

强子散射对相对论重离子碰撞中Λ极化的影响
我们在一个简单的强子模型中计算了Λ超子自旋翻转和非翻转的截面,包括涉及自旋3/2、正奇偶共振的-通道过程和通过标量介子交换的-通道过程。由于Λ介子的质量很大,与-沟道过程中1/3.5的恒定值相比,-沟道过程中Λ自旋翻转到非翻转的截面小得可以忽略不计。在一个示意性动力学模型中包含了-沟道自旋相关截面,研究了在GeV的金-金对撞中强子散射对Λ自旋极化的影响。研究发现,在这些对撞的强子阶段,Λ自旋极化只降低了7-12%,这证明了理论研究中的假设是正确的,即把化学冻结时计算的Λ极化与动力学冻结时测量的Λ极化进行比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physics Letters B
Physics Letters B 物理-物理:综合
CiteScore
9.10
自引率
6.80%
发文量
647
审稿时长
3 months
期刊介绍: Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.
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