奇异强子的冻结动力学研究

S. Singh, P. Ghosh, Jajati k. Nayak
{"title":"奇异强子的冻结动力学研究","authors":"S. Singh, P. Ghosh, Jajati k. Nayak","doi":"10.1103/PhysRevD.104.034027","DOIUrl":null,"url":null,"abstract":"We study the chemical freeze-out dynamics of strange particles ($K,\\, \\Lambda,\\, \\Sigma$) from a homogeneous and isotropically expanding hadronic system of $\\pi, K, \\rho, N, \\Lambda$ and $\\Sigma$ with zero net baryon density. We use the momentum integrated Boltzmann equation and study their evolution over the bulk hadronic matter, a condition being similar to the one created at top RHIC and LHC energies. The cross-sections, which are input to the equations, are taken either from phenomenological models or parameterized by comparing against experimental data. From this microscopic calculation we find that these strange particles freeze-out near transition temperature $\\approx T_c$ due to large relaxation time. The continuous cease of the inelastic processes due to gradual fall in the temperature and decrease in the number density, thus lead to early freeze out of strange hadrons $K, \\Lambda$ and $\\Sigma$ which happens sequentially near $T_c$. However, freeze-out of these strange species near Tc appears as a sudden and simultaneous process, which is mostly predicted by thermal model while explaining the yield of identified particles at RHIC and LHC energies.","PeriodicalId":8463,"journal":{"name":"arXiv: Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Study of freeze-out dynamics of strange hadrons\",\"authors\":\"S. Singh, P. Ghosh, Jajati k. Nayak\",\"doi\":\"10.1103/PhysRevD.104.034027\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We study the chemical freeze-out dynamics of strange particles ($K,\\\\, \\\\Lambda,\\\\, \\\\Sigma$) from a homogeneous and isotropically expanding hadronic system of $\\\\pi, K, \\\\rho, N, \\\\Lambda$ and $\\\\Sigma$ with zero net baryon density. We use the momentum integrated Boltzmann equation and study their evolution over the bulk hadronic matter, a condition being similar to the one created at top RHIC and LHC energies. The cross-sections, which are input to the equations, are taken either from phenomenological models or parameterized by comparing against experimental data. From this microscopic calculation we find that these strange particles freeze-out near transition temperature $\\\\approx T_c$ due to large relaxation time. The continuous cease of the inelastic processes due to gradual fall in the temperature and decrease in the number density, thus lead to early freeze out of strange hadrons $K, \\\\Lambda$ and $\\\\Sigma$ which happens sequentially near $T_c$. However, freeze-out of these strange species near Tc appears as a sudden and simultaneous process, which is mostly predicted by thermal model while explaining the yield of identified particles at RHIC and LHC energies.\",\"PeriodicalId\":8463,\"journal\":{\"name\":\"arXiv: Nuclear Theory\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv: Nuclear Theory\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1103/PhysRevD.104.034027\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Nuclear Theory","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1103/PhysRevD.104.034027","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

摘要

我们研究了净重子密度为零的均匀和各向同性膨胀的$\pi, K, \rho, N, \Lambda$和$\Sigma$强子系统中奇异粒子($K,\, \Lambda,\, \Sigma$)的化学冻结动力学。我们使用动量积分玻尔兹曼方程并研究它们在整体强子物质上的演化,这种情况类似于在RHIC和LHC的最高能量下产生的情况。输入方程的横截面要么取自现象学模型,要么通过与实验数据比较而参数化。从微观计算中我们发现,由于弛豫时间大,这些奇怪的粒子在转变温度$\approx T_c$附近被冻结。由于温度的逐渐下降和数量密度的降低,非弹性过程的持续停止,导致奇异强子$K, \Lambda$和$\Sigma$的早期冻结,并在$T_c$附近依次发生。然而,这些奇怪的物质在Tc附近的冻结是一个突然而同步的过程,这主要是用热模型来预测的,同时解释了在RHIC和LHC能量下确定的粒子的产率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of freeze-out dynamics of strange hadrons
We study the chemical freeze-out dynamics of strange particles ($K,\, \Lambda,\, \Sigma$) from a homogeneous and isotropically expanding hadronic system of $\pi, K, \rho, N, \Lambda$ and $\Sigma$ with zero net baryon density. We use the momentum integrated Boltzmann equation and study their evolution over the bulk hadronic matter, a condition being similar to the one created at top RHIC and LHC energies. The cross-sections, which are input to the equations, are taken either from phenomenological models or parameterized by comparing against experimental data. From this microscopic calculation we find that these strange particles freeze-out near transition temperature $\approx T_c$ due to large relaxation time. The continuous cease of the inelastic processes due to gradual fall in the temperature and decrease in the number density, thus lead to early freeze out of strange hadrons $K, \Lambda$ and $\Sigma$ which happens sequentially near $T_c$. However, freeze-out of these strange species near Tc appears as a sudden and simultaneous process, which is mostly predicted by thermal model while explaining the yield of identified particles at RHIC and LHC energies.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信