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arXiv 2101.02685hep-phhep-ex
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用EPOS和JEWEL事件发生器研究$\sqrt{s_{NN}}$ = 2.76 TeV的Pb-Pb碰撞中介质修正喷流形状观测值

Study of medium modified jet shape observables in Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using EPOS and JEWEL event generators

Sumit Kumar Saha, Debojit Sarkar, Subhasis Chattopadhyay, Ashik Ikbal Sheikh, Sidharth Kumar Prasad

摘要:

高能重离子碰撞中的喷流-介质相互作用是表征这类碰撞产生的热重介质的重要现象。介质引起的修改的子结构的包容性带电射流的研究表明,重新分配的能量内的射流锥,并提供洞察介质中的射流的能量损失机制。我们研究了两个射流形状观测量的介质修正,在$\sqrt{s_{NN}} ~=~ 2.76 $ TeV的最中心的$Pb-Pb$碰撞中,使用两个常用的事件发生器,JEWEL(反冲关闭)和EPOS-3,jet-p $_T$范围为20-40 GeV/c。反冲关闭的JEWEL主要用作参考系,因为已发现它能令人满意地解释全球喷流观测值,但在较高喷流半径处缺乏喷流形状变量。EPOS-3很好地解释了这种碰撞中的体积特性,它考虑了流体动力学演变的体积物质、射流和软硬相互作用。这些模型的结果之间的比较表明,虽然JEWEL(反冲关闭)不能解释损失的能量在相对于射流轴的更高半径的分布,EPOS-3解释效果相当不错。然而,在EPOS-3中,强子化和强子级联阶段的部分子能量损失机制和二次软硬相互作用不同于传统的喷流能量损失模型。因此,目前的研究可以提供重要的新见解的机制有关的介质和硬-软相互作用的建模重离子碰撞。

英文摘要:

The jet-medium interaction in high energy heavy ion collisions is an important phenomena to characterize the hot and dense medium produced in such collisions. The study of medium-induced modifications to the substructure of inclusive charged jets indicates a redistribution of energy inside the jet cone and provides insight into the energy loss mechanisms of jets in the medium. We investigate the in-medium modification to two jet shape observables i.e., the differential jet shape ($ρ$(r)) and the angularity (g) in the most central $Pb-Pb$ collisions at $\sqrt{s_{NN}} ~=~ 2.76 $ TeV using two commonly used event generators i.e., JEWEL (recoil OFF) and EPOS-3 in the jet-p$_T$ range of 20-40 GeV/c. JEWEL with recoil OFF has been used primarily as a reference system as that has been found to explain the global jet observables satisfactorily but lacks in jet-shape variables at higher jet-radii. EPOS-3 that explains the bulk properties in such collisions quite well takes into account a hydrodynamically evolving bulk matter, jets and hard-soft interactions. A comparison between the results from these models shows that while JEWEL (recoil OFF) does not explain the distribution of lost energy at higher radii with respect to the jet-axis, EPOS-3 explains the effect quite well. However, in EPOS-3, the partonic energy loss mechanism and secondary hard-soft interactions during hadronization and hadronic cascade phase are different from the conventional jet energy loss models. The current study can, therefore, provide important new insights on mechanisms regarding the modeling of the medium and hard-soft interactions in heavy ion 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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