arXiv 2006.147392020-06hep-phhep-exnucl-th

从低能量到超相对论能量的基本核子-核子反应中的强子产生

Hadron production in elementary nucleon-nucleon reactions from low to ultra-relativistic energies

V. Kireyeu, I. Grishmanovskii, V. Kolesnikov, V. Voronyuk, E. Bratkovskaya

备注：: 18 pages, 17 figures; extended version to be published in the European Physical Journal A

摘要：

我们研究了强子产生的$p+p$，$p+n$和$n+n$反应中的微观粒子强子动力学（PHSD）的传输方法相比，PYTHIA 8.2。我们讨论的细节“PHSD调”的隆德弦模型（实现事件发生器FRITIOF和PYTHIA）在真空中（如在$N+N$碰撞），以及其在介质中的修改相关的重离子碰撞的热和致密的物质产生。我们比较了PHSD和PYTHIA 8.2（缺省版本）在$\sqrt{s_{NN}} = 2.7 - 7000$ GeV能量范围内对$p+p$、$p+n$和$n+n$反应中强子多重数的激发函数以及微分快度$y$、横动量$p_T$和$x_F$分布的计算结果与现有的实验数据.我们讨论了强子的产生机制和末态相互作用（FSI）的作用，由于强子再散射。我们还展示了可能夸克-胶子等离子体（QGP）的形成对强子观测值在$p+p$碰撞在LHC能量的影响。我们强调的重要性，开发一个可靠的事件发生器的基本反应，从低到超相对论能量的实际和即将到来的重离子实验。

英文摘要：

We study the hadron production in $p+p$, $p+n$ and $n+n$ reactions within the microscopic Parton-Hadron-Dynamics (PHSD) transport approach in comparison to PYTHIA 8.2. We discuss the details of the "PHSD tune" of the Lund string model (realized by event generators FRITIOF and PYTHIA) in the vacuum (as in $N+N$ collisions) as well as its in-medium modifications relevant for heavy-ion collisions where a hot and dense matter is produced. We compare the results of PHSD and PYTHIA 8.2 (default version) for the excitation function of hadron multiplicities as well as differential rapidity $y$, transverse momentum $p_T$ and $x_F$ distributions in $p+p$, $p+n$ and $n+n$ reactions with the existing experimental data in the energy range $\sqrt{s_{NN}} = 2.7 - 7000$ GeV. We discuss the production mechanisms of hadrons and the role of final state interactions (FSI) due to the hadronic rescattering. We also show the influence of the possible quark-gluon plasma (QGP) formation on hadronic observables in $p+p$ collisions at LHC energies. We stress the importance of developing a reliable event generator for elementary reactions from low to ultra-relativistic energies in view of actual and upcoming heavy-ion experiments.

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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英文摘要：

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