论文标题
通过高能碰撞中的新方法分析横向动量光谱
Analyzing transverse momentum spectra by a new method in high-energy collisions
论文作者
论文摘要
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）质量中心能量的碰撞范围为2.16至2760 GEV。所考虑的粒子的横向动量被认为是两个参与者的参与者的关节贡献，它们遵守了经过修饰的tsallis样横向动量分布，并具有随机的叠加方位角。通过Monte Carlo方法进行粒子横向动量分布的计算，并将其与国际协作测量的实验数据进行了比较。有效温度和其他参数的激发函数在被考虑的能量范围内获得。随着碰撞能量的增加，有效温度参数迅速增加，然后缓慢增加。边界出现在5 GEV左右，这意味着反应机理和/或生成物质的变化。
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.
