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arXiv 1906.09562nucl-thhep-phnucl-ex
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在LHC能量下包容喷流和$γ$ -喷流喷流形状的核修正

Nuclear modification of jet shape for inclusive jets and $γ$-jets at the LHC energies

Ning-Bo Chang, Yasuki Tachibana, Guang-You Qin

摘要:

利用我们的喷流-流体耦合模型,我们研究了Pb+Pb碰撞中$5.02$ ~ATEV和$2.76$ ~ATEV的单包容喷流和$γ$ -喷流的全喷流和喷流结构的核修正。考虑碰撞能量损失、横向动量展宽和介质诱导分裂过程的影响,用一组耦合输运方程描述了全喷流簇射的介质内演化。通过求解含源项的相对论流体动力学方程,模拟了硬射流簇射到软介质中沉积的能量和动量。我们的研究表明,射流传播的流体动力学介质响应显着提高扩大射流形状在大角度,是必不可少的锥形尺寸依赖的射流能量损失和核修改因子的包容性射流生产。同时还发现,喷注形状的核修正模式对喷注能量敏感,但对引发喷注的部分子的味道依赖性较弱。我们的结果可以很自然地解释CMS协作组观测到的单个包容性喷流和$γ$ -喷流事件的喷流形状函数的不同核修正模式,并且可以在将来通过测量重离子碰撞中更宽范围喷流能量的喷流形状函数来检验。

英文摘要:

With our coupled jet-fluid model, we study the nuclear modifications of full jets and jet structures for single inclusive jets and $γ$-jets in Pb+Pb collisions at $5.02$~ATeV and $2.76$~ATeV. The in-medium evolution of full jet shower is described by a set of coupled transport equations including the effects of collisional energy loss, transverse momentum broadening and medium-induced splitting process. The dynamical evolution of bulk medium is simulated by solving relativistic hydrodynamic equation with source term which accounts for the energy and momentum deposited by hard jet shower to soft medium. Our study demonstrates that the hydrodynamic medium response to jet propagation significantly enhances the broadening of jet shape at large angles and is essential for the cone-size dependence of jet energy loss and nuclear modification factor of inclusive jet production. It is also found that the nuclear modification pattern of jet shape is sensitive to jet energy but has weak dependence on the flavor of the parton that initiates the jet. Our result can naturally explain the different nuclear modification patterns of jet shape functions for single inclusive jet and $γ$-jet events as observed by the CMS Collaboration, and can be tested in the future by measuring the jet shape function over a wider range of jet energies 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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