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arXiv 1402.6813hep-phnucl-th
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大型强子对撞机高多重数质子-质子碰撞中横向径向流的指示

Indication of transverse radial flow in high-multiplicity proton-proton collisions at the Large Hadron Collider

Premomoy Ghosh, Sanjib Muhuri, Jajati k. Nayak, Raghava Varma

摘要:

我们根据爆炸波模型,分析了在$\sqrt {s}$ = 0.9、2.76和7 TeV的$pp$碰撞中测量的$π^\pm$、$K^\pm$、$p$($\bar p$)光谱,提取了$pp$碰撞形成的体系冻结时的横向径向流速和动力学温度。本文研究了爆炸波参数对事件样本的平均带电粒子多重性或碰撞的“中心性”的依赖性,并与核-核($AA$)和质子-核($pA$)碰撞中的类似分析结果进行了比较。我们还分析了$K_{s}^0$、$Λ$($\bar Λ$)和$Ξ^-$的光谱,以了解爆炸波描述对所产生粒子种类的依赖性。在爆炸波模型的框架内,研究揭示了在大型强子对撞机的$pp$碰撞的高多重性事件的集体行为的迹象。高多重数$pp$碰撞中的强横向径向流及其与$pA$和$AA$碰撞中的横向径向流的比较与最近的理论工作[Shuryak和Zahed 2013 arXiv:1301.4470]中的预测相匹配,该理论工作解决了流体动力学在$pp$和$pA$碰撞中的适用性条件。

英文摘要:

We analyze the measured spectra of $π^\pm$, $K^\pm$, $p$($\bar p$) in $pp$ collisions at $\sqrt {s}$ = 0.9, 2.76 and 7 TeV, in the light of blast-wave model to extract the transverse radial flow velocity and kinetic temperature at freeze-out for the system formed in $pp$ collisions. The dependency of the blast-wave parameters on average charged particle multiplicity of event sample or the `centrality' of collisions has been studied and compared with results of similar analysis in nucleus-nucleus ($AA$) and proton-nucleus ($pA$) collisions. We analyze the spectra of $K_{s}^0$, $Λ$($\bar Λ$) and $Ξ^-$ also to see the dependence of blast-wave description on the species of produced particles. Within the framework of the blast-wave model, the study reveals indication of collective behavior for high-multiplicity events in $pp$ collisions at LHC. Strong transverse radial flow in high multiplicity $pp$ collisions and its comparison with that in $pA$ and $AA$ collisions match with predictions from a very recent theoretical work [Shuryak and Zahed 2013 arXiv:1301.4470] that addresses the conditions for applicability of hydrodynamics in $pp$ and $pA$ collisions.

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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