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arXiv 2102.05967nucl-thhep-ph
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低能重离子碰撞中各向异性流和粒子产生对束流能量和核物质状态方程的依赖性

Dependence on beam energy and nuclear equation of state dependence of anisotropic flow and particle production in low-energy heavy-ion collisions

Sumit Kumar Kundu, Yoshini Bailung, Sudhir Pandurang Rode, Partha Pratim Bhaduri, Ankhi Roy

摘要:

本文分析了在$\rm E_{\rm Lab}$ $=$ $1A -158A$ GeV束流能量范围内,中-中心($b$ $=$ 5- 9 $fm$)Au + Au碰撞中末态粒子各向异性动量分布的各种流量系数。超相对论量子分子动力学(UrQMD)模型的不同变体,即纯输运(级联)模式和混合模式,用于本调查。在混合UrQMD模式中,理想的流体动力学演化与纯输运计算相结合来描述火球的演化。我们选择了不同的可用状态方程(EoS)复制强子以及部分子自由度连同可能的相变,即强子气体,手征+ deconfinement EoS和袋模型EoS,研究其对最终状态粒子的性质的影响。我们还试图通过研究粒子产生的不同特征,如粒子比和净质子快度分布,来了解介质的动力学。这里得出的结果和结论将是有用的,以了解各种可观测的模型的基础物理的响应,以及与即将到来的测量在未来的实验中的反质子和离子研究设施(FAIR)和基于Nuclotron的离子对撞机fAcility(NICA)进行比较。

英文摘要:

We analyse various flow coefficients of anisotropic momentum distribution of final state particles in mid-central ($b$ $=$ 5--9 $fm$) Au + Au collisions in the beam energy range $\rm E_{\rm Lab}$ $=$ $1A -158A$ GeV. Different variants of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, namely the pure transport (cascade) mode and the hybrid mode, are employed for this investigation. In the hybrid UrQMD model, the ideal hydrodynamical evolution is integrated with the pure transport calculation for description of the evolution of the fireball. We opt for the different available equations of state (EoS) replicating the hadronic as well as partonic degrees of freedom together with possible phase transitions, viz. hadron gas, chiral + deconfinement EoS and bag model EoS, to investigate their effect on the properties of the final state particles. We also attempt to gain insights about the dynamics of the medium by studying different features of particle production such as particle ratios and net-proton rapidity distribution. The results and conclusions drawn here would be useful to understand the response of various observables to the underlying physics of the model as well as to make comparisons with the upcoming measurements of the future experiments at Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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