arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.11337nucl-thhep-phnucl-ex
收藏

用贝叶斯参数估计从包含强子抑制测量确定喷流输运系数$\hat{q}$

Determining the jet transport coefficient $\hat{q}$ from inclusive hadron suppression measurements using Bayesian parameter estimation

S. Cao, Y. Chen, J. Coleman, J. Mulligan, P. M. Jacobs, R. A. Soltz, A. Angerami, R. Arora, S. A. Bass, L. Cunqueiro, T. Dai, L. Du, R. Ehlers, H. Elfner, D. Ev… 展开作者

S. Cao, Y. Chen, J. Coleman, J. Mulligan, P. M. Jacobs, R. A. Soltz, A. Angerami, R. Arora, S. A. Bass, L. Cunqueiro, T. Dai, L. Du, R. Ehlers, H. Elfner, D. Everett, W. Fan, R. J. Fries, C. Gale, F. Garza, Y. He, M. Heffernan, U. Heinz, B. V. Jacak, S. Jeon, W. Ke, B. Kim, M. Kordell, A. Kumar, A. Majumder, S. Mak, M. McNelis, C. Nattrass, D. Oliinychenko, C. Park, J. -F. Paquet, J. H. Putschke, G. Roland, A. Silva, B. Schenke, L. Schwiebert, C. Shen, C. Sirimanna, Y. Tachibana, G. Vujanovic, X. -N. Wang, R. L. Wolpert, Y. Xu

摘要:

本文报道了夸克-胶子等离子体喷流输运系数$\hat{q}$的新测定。我们使用的JETSCAPE框架,它采用了一种新的多阶段的理论方法,在介质射流的演变和贝叶斯推断参数提取。的计算,物质和LBT喷流淬灭模型的基础上,包括强子抑制在RHIC和铅+铅碰撞在LHC的Au+Au碰撞的实验测量进行了比较。在参数提取中考虑了实验系统不确定度的相关性。$\hat{q}$对射流能量或虚拟性和介质温度的功能依赖性是基于介质中散射的微扰图像,其中组件反映了物质和LBT的不同适用性。在多阶段方法中,MATTER和LBT之间的切换由虚拟性标度$Q_0$管理。后模型预测的RHIC和LHC强子抑制数据的比较显示出合理的协议,在相空间的有限区域适度的张力。从后验分布中提取的$\hat{q}/T^3$的分布表现出对射流动量和介质温度$T$的弱依赖性,90%的可信区域(CR)取决于模型配置的具体选择。选择MATTER+LBT,在虚拟$Q_0$处切换,对于$p_\mathrm{T}^\mathrm{jet}>40$ GeV/c具有90%的$2<\hat{q}/T^3<4$ CR。首次测定的$Q_0$的值在2.0-2.7 GeV的范围内。

英文摘要:

We report a new determination of $\hat{q}$, the jet transport coefficient of the Quark-Gluon Plasma. We use the JETSCAPE framework, which incorporates a novel multi-stage theoretical approach to in-medium jet evolution and Bayesian inference for parameter extraction. The calculations, based on the MATTER and LBT jet quenching models, are compared to experimental measurements of inclusive hadron suppression in Au+Au collisions at RHIC and Pb+Pb collisions at the LHC. The correlation of experimental systematic uncertainties is accounted for in the parameter extraction. The functional dependence of $\hat{q}$ on jet energy or virtuality and medium temperature is based on a perturbative picture of in-medium scattering, with components reflecting the different regimes of applicability of MATTER and LBT. In the multi-stage approach, the switch between MATTER and LBT is governed by a virtuality scale $Q_0$. Comparison of the posterior model predictions to the RHIC and LHC hadron suppression data shows reasonable agreement, with moderate tension in limited regions of phase space. The distribution of $\hat{q}/T^3$ extracted from the posterior distributions exhibits weak dependence on jet momentum and medium temperature $T$, with 90\% Credible Region (CR) depending on the specific choice of model configuration. The choice of MATTER+LBT, with switching at virtuality $Q_0$, has 90\% CR of $2<\hat{q}/T^3<4$ for $p_\mathrm{T}^\mathrm{jet}>40$ GeV/c. The value of $Q_0$, determined here for the first time, is in the range 2.0-2.7 GeV.

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。

↑