论文标题
PP碰撞中使用Tsallis统计数据的集体扩展
Collective expansion in pp collisions using the Tsallis statistics
论文作者
论文摘要
我们研究了横向动量($ p _ {\ rm t} $)在最小偏置质子质子(PP)碰撞中识别出的Hadrons的光谱,在0.9、2.76、5.02、7和13 tev中的质量质量($ \ sqrt {s} $)中,在Tsallis-blast-blass Wave(Tsallis-Blast Wave)中(TB)模型(TB)tev。发现该模型很好地描述了高达10 GEV/c的粒子光谱。径向流($ \langleβ\ rangle $)随碰撞能量而增加。非平衡度($ Q $)和Tsallis温度参数($ t $)的程度显示出类似的行为,但趋势较弱。鉴于冻结参数对碰撞能量的这种依赖性,我们评估了$ \ langleβ\ rangle $,$ t $和$ q $ pp碰撞的$ \ sqrt {s} = $ 8和14 tev,并在这两个能源下预测粒子光谱。此外,为了研究冻结参数的多重性依赖性,在$ \ sqrt {s} = $ 7和13 tev的PP碰撞中,TBW模型在不同带电的粒子多重性类中扩展到光谱。可以观察到,在这两种能量中,径向流动随多重性的增加而增加,而非平衡程度则显示出相反的行为,这与在大型Hadron Collider(LHC)能量的Proton-Nucleus(PA)和Nucleus-Nucleus(aa)碰撞中观察到的行为相似。但是,TSALLIS温度参数随着多重性的增加而增加,这与PA和AA碰撞的趋势相反。在类似的倍增性下,PP碰撞中的径向流量比PA和AA碰撞中的径向流动更强,这表明碰撞系统的大小对最终状态粒子动力学有重大影响。最后,我们对tsallis温度参数进行额外的流校正,发现多普勒校正的温度参数几乎以统一的方式缩放,尽管碰撞系统和碰撞能量有所不同。
We investigate the transverse momentum ($p_{\rm T}$) spectra of identified hadrons in minimum-bias proton-proton (pp) collisions at a centre-of-mass energy ($\sqrt{s}$) of 0.9, 2.76, 5.02, 7 and 13 TeV in the framework of Tsallis-blast wave (TBW) model. It is found that the model describes well the particle spectra up to 10 GeV/c. The radial flow ($\langle β\rangle$) increases with the collision energy. The degrees of non-equilibrium ($q$) and the Tsallis temperature parameter ($T$) show a similar behaviour, but with a much weaker trend. With this dependence of the freeze-out parameters on the collision energy, we evaluate $\langle β\rangle$, $T$ and $q$ in pp collisions at $\sqrt{s}=$ 8 and 14 TeV and predict the particle spectra at these two energies. Moreover, in order to investigate the multiplicity dependence of the freeze-out parameters, the TBW model is extended to the spectra at different charged-particle multiplicity classes in pp collisions at $\sqrt{s}=$ 7 and 13 TeV. It is observed that at both energies the radial flow increases with the multiplicity while the degree of non-equilibrium shows an opposite behaviour, which is similar to that observed in proton-nucleus (pA) and nucleus-nucleus (AA) collisions at the Large Hadron Collider (LHC) energies. However, the Tsallis temperature parameter increases with the multiplicity, which is opposite to the trend in pA and AA collisions. At similar multiplicities, the radial flow in pp collisions is stronger than those in pA and AA collisions, indicating that the size of the colliding system has significant effects on the final state particle dynamics. Finally, we apply an additional flow correction to the Tsallis temperature parameter and find that the doppler-corrected temperature parameter almost scales with the multiplicity in a uniform way, despite the difference in the colliding system and collision energy.