Hadronic effects on Λ polarization in relativistic heavy ion collisions
arxiv(2024)
摘要
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. Although the t-channel
process gives a thermally averaged cross section that is about a factor of 1.3
larger than that from the s-channel process, the Λ spin flip to
non-flip cross sections is negligibly small in the t-channel compared to the
constant value of 1/3.5 in the s-channel process. With these cross sections
included in a schematic kinetic model, the effects of hadronic scatterings on
the Λ spin polarization in Au-Au collisions at √(s)_NN=7.7 GeV
are studied. It is found that the Λ spin polarization only decreases by
about 7% during the hadronic stage of these collisions, which thus justifies
the assumption in theoretical studies that compare the Λ polarization
calculated at the chemical freeze out to the measured one at the kinetic freeze
out.
更多查看译文
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要