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arXiv 2201.02069hep-phhep-exnucl-exnucl-th
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用一种新方法分析高能碰撞中的横动量谱

Analyzing transverse momentum spectra by a new method in high-energy collisions

Li-Li Li, Fu-Hu Liu, Muhammad Waqas, Muhammad Ajaz

摘要:

我们分析了正负电荷π介子的横动量谱($π^+$和$π^-$),带正电荷和负电荷的K介子($K^+$和$K^-$)、质子和反质子($p$和$\bar p$),以及中心核-核碰撞中快度区产生的$ϕ$。质量能量范围从2.16到2760 GeV每核子对。所考虑的粒子的横向动量被视为两个参与部分子的联合贡献,这两个部分子服从修改的Tsallis类横向动量分布,并具有随机方位角叠加。用蒙特卡罗方法计算了粒子的横向动量分布,并与国际合作测量的实验数据进行了比较。在所考虑的能量范围内,得到了有效温度等参数的激发函数。随着碰撞能量的增加,有效温度参数先增大后减小。边界出现在5 GeV附近,这意味着反应机制和/或生成物质的变化。

英文摘要:

We analyzed the transverse momentum spectra of positively and negatively charged pions ($π^+$ and $π^-$), positively and negatively charged kaons ($K^+$ and $K^-$), protons and antiprotons ($p$ and $\bar p$), as well as $ϕ$ produced in mid-(pseudo)rapidity region in central nucleus--nucleus (AA) collisions over a center-of-mass energy range from 2.16 to 2760 GeV per nucleon pair. The transverse momentum of the considered particle is regarded as the joint contribution of two participant partons which obey the modified Tsallis-like transverse momentum distribution and have random azimuths in superposition. The calculation of transverse momentum distribution of particles is performed by the Monte Carlo method and compared with the experimental data measured by international collaborations. The excitation functions of effective temperature and other parameters are obtained in the considered energy range. With the increase of collision energy, the effective temperature parameter increases quickly and then slowly. The boundary appears at around 5 GeV, which means the change of reaction mechanism and/or generated matter.

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