在LHC能量下观察到的$p_T$区域背后的意义
The meaning behind observed $p_T$ regions at the LHC energies
摘要：
我们认为，$p_T$分布数据从大型强子对撞机的$pp$碰撞在$\sqrt{s}=0.9 TeV, 2.76 TeV,7TeV$和$Pb-Pb$碰撞在$\sqrt{s_{NN}}=2.76 TeV$与6个中心仓的带电初级粒子的不变微分产额包含几个$p_T$区域具有特殊的性质。通过用指数函数拟合数据来分析这些分布。我们认为这些区域反映了弦动力学过程中部分子碎裂和强子化的特征。核透明度导致介质对III区（$p_T >17-20 GeV/c$）的影响可忽略不计，该区域具有最高的$p_T$值。培养基的影响和变化在II区（$4-6 GeV/c < p_T< 17-20 GeV/c$）中开始微弱地出现，而在I区（$p_T <4-6 GeV/c$）中变得更强。看起来II区的弦数最多。在这个区域弦密度的增加可能导致弦的融合，一个新的弦的出现和集体行为的部分子在最中心的碰撞。这些现象可以解释核修饰因子在Ⅱ区的反常行为。我们建议II区作为夸克胶子等离子体通过弦聚变形成的可能区域。第一个$p_T$区域是强子数最多而弦数最少的区域，这是由于低能弦直接强子化为两个夸克系统-介子。
英文摘要：
We argue that $p_T$ distribution data from the LHC on the invariant differential yield of the charged primary particles in $pp$ collisions at $\sqrt{s}=0.9 TeV, 2.76 TeV,7TeV$ and in $Pb-Pb$ collisions at $\sqrt{s_{NN}}=2.76 TeV$ with 6 centrality bins contains several $p_T$ regions with special properties. These distributions were analysed by fitting the data with exponential functions. We conclude that the regions reflect features of fragmentation and hadronization of partons through the string dynamics. The nuclear transparency results in negligible influence of the medium in the III region ($p_T >17-20 GeV/c$), which has highest $p_T$ values. The effects and changes by the medium start to appear weakly in the II region ($4-6 GeV/c < p_T< 17-20 GeV/c$) and become stronger in the I region ($p_T <4-6 GeV/c$) . It seems that the II region has highest number of strings. The increase in string density in this region could lead to fusion of strings, appearance of a new string and collective behaviour of the partons in the most central collisions. These phenomena can explain anomalous behaviour of the Nuclear Modification Factor in the II region. We propose the II region as a possible area of Quark Gluon Plasma formation through string fusion. The first $p_T$ regions are the ones with the maximum number of hadrons and minimum number of strings due to direct hadronization of the low energy strings into two quark systems - mesons.
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