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arXiv 2010.13680hep-phnucl-th
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在一个校准的输送模式中对单个包含喷流的QGP修正

QGP modification to single inclusive jets in a calibrated transport model

Weiyao Ke, Xin-Nian Wang

摘要:

利用输运模型研究了夸克-胶子等离子体(QGP)中包含喷注的抑制和修正。该模型包括高虚拟度下的类真空部分子簇射演化、射流-介质相互作用的线性输运以及射流诱导介质流体动力学响应的简单分析。在RHIC和LHC上测量的0-10%中心Au-Au和Pb-Pb碰撞中,模型参数被标定为包含强子$R_{AA}^{h}$和具有锥尺寸$R=0.4$的单包含喷流$R_{AA}^{j}$的核修正因子.校准后的模型一致地描述了锥大小相关的$R_{AA}^{j}(R)$,修改包括射流破碎功能和射流形状。我们讨论了这些修改的起源,通过分析该模型中的介质诱导射流能量流,并阐明硬部分子演化和射流诱导介质响应的相互作用。特别地,我们证明了在大$r=\sqrt{Δη^2+Δϕ^2}$中,在$p_T\sim 2$ GeV/ $c$处的喷注碎裂函数和喷注形状中的软强子过量是软介质诱导的胶子辐射和喷注诱导的介质激发的结果。

英文摘要:

We study inclusive jet suppression and modifications in the quark-gluon plasma (QGP) with a transport-based model. The model includes vacuum-like parton shower evolution at high-virtuality, a linearized transport for jet-medium interactions, and a simple ansatz for the jet-induced hydrodynamic response of the medium. Model parameters are calibrated to nuclear modification factors for inclusive hadron $R_{AA}^{h}$ and single inclusive jets $R_{AA}^{j}$ with cone size $R=0.4$ in 0-10% central Au-Au and Pb-Pb collisions measured at the RHIC and LHC. The calibrated model consistently describes the cone-size dependent $R_{AA}^{j}(R)$, modifications to inclusive jet fragmentation functions and jet shape. We discuss the origin of these modifications by analyzing the medium-induced jet energy flow in this model and elucidate the interplay of hard parton evolution and jet-induced medium response. In particular, we demonstrate that the excess of soft hadrons at $p_T\sim 2$ GeV/$c$ in jet fragmentation function and jet shape at large $r=\sqrt{Δη^2+Δϕ^2}$ are consequences of both soft medium-induced gluon radiation and jet-induced medium excitation.

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