重新访问贝叶斯对QCD的运输系数的约束

论文标题

重新访问贝叶斯对QCD的运输系数的约束

Revisiting Bayesian constraints on the transport coefficients of QCD

论文作者

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

论文摘要

基于相对论粘性流体动力学的多阶段模型已被证明在描述了相对论核碰撞中的强子测量方面成功。这些测量值对QCD的剪切和大量粘度敏感，并提供了限制这些传输系数的独特机会。贝叶斯分析可用于通过有条理的模型到数据比较来获得QCD粘度的系统约束。在本手稿中，我们讨论了贝叶斯分析重离子碰撞数据的最新发展。我们强调了封闭测试在与测量结果进行比较之前验证贝叶斯分析中的基本作用。我们讨论了模拟器的作用，该作用被用作多阶段理论模型的代理。我们将持续的贝叶斯对软强子测量的分析通过Jetscape协作作为讨论的背景。

Multistage models based on relativistic viscous hydrodynamics have proven successful in describing hadron measurements from relativistic nuclear collisions. These measurements are sensitive to the shear and the bulk viscosities of QCD and provide a unique opportunity to constrain these transport coefficients. Bayesian analyses can be used to obtain systematic constraints on the viscosities of QCD, through methodical model-to-data comparisons. In this manuscript, we discuss recent developments in Bayesian analyses of heavy ion collision data. We highlight the essential role of closure tests in validating a Bayesian analysis before comparison with measurements. We discuss the role of the emulator that is used as proxy for the multistage theoretical model. We use an ongoing Bayesian analysis of soft hadron measurements by the JETSCAPE Collaboration as context for the discussion.

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