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arXiv 1602.01701nucl-thnucl-ex
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HIJING程序中$\sqrt{s_{NN}}=2.76$ TeV上$Pb+Pb$碰撞中相互作用核子的运动学约束

Kinematic constrains on interacting nucleons in $Pb+Pb$ collisions at $\sqrt{s_{NN}}=2.76$ TeV within the HIJING code

Khaled Abdel-Waged, Nuha Felemban

摘要:

采用重离子喷流相互作用发生器(HIJING)程序,结合集体级联方案,研究了大型强子对撞机(LHC)重离子碰撞中相互作用核子的运动学约束.后者是用来实现能量动量守恒约束的初级和次级相互作用核子。结果表明,在$\sqrt{s_{NN}} =2.76$ TeV的Pb + Pb碰撞中,在不同中心度(从中心碰撞(0 - 5%)到外围碰撞(70 - 80%))下,相互作用核子的能量动量守恒约束影响了整个带电粒子赝快度密度分布$(\frac{dN_{ch}}{dη})$.特别是,相互作用核子的运动学约束,以减少$(\frac{dN_{ch}}{dη})$产额在中赝快度$(\lvertη\rvert<2)$在所有中心间隔,这是一致的LHC数据。此外,该模型预测了在$\lvertη\rvert>8$强子产生的增强,这可以在未来的ALICE零度量能器检查。发现这种增强主要是由于质子在碰撞的旁观者部分的相互作用。这表明运动学约束对于正确处理LHC能区Pb + Pb碰撞的几何关系是重要的。

英文摘要:

The kinematic constrains on interacting nucleons in Large Hadron Collider (LHC) heavy-ion collisions are investigated in the framework of the Heavy Ion Jet Interaction Generator (HIJING) code incorporated with a collective cascade recipe. The latter is used to implement energy-momentum conservation constrains on both primary and secondary interacting nucleons. It is found that the energy-momentum conservation constrains on the interacting nucleons affect the whole charged particle pseudo-rapidity density distribution $(\frac{dN_{ch}}{dη})$, at different centralities (from central (0-5\%) to peripheral (70-80\%) collisions), in Pb+Pb collisions at $\sqrt{s_{NN}} =2.76$ TeV. In particular, the kinematic constrains on interacting nucleons are shown to reduce $(\frac{dN_{ch}}{dη})$ yield at mid-pseudorapidity $(\lvertη\rvert<2)$ in all centrality intervals, which is consistent with the LHC data. In addition, the model predicts an enhancement of the hadron production at $\lvertη\rvert>8$, which could be checked in future ALICE Zero Degree calorimeter. Such an enhancement is found to be mainly due to the interactions of protons at the spectator parts of the collision. This indicates that the kinematic constrains are important for a correct geometrical treatment of Pb+Pb collisions at LHC energies.

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