Charmed hadron chemistry in relativistic heavy-ion collisions

Charmed hadron chemistry in relativistic heavy-ion collisions
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相对论性重离子碰撞中的迷人强子化学

DOI:
10.1016/j.physletb.2020.135561
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发表时间:
2019-11
期刊:
影响因子:
4.4
通讯作者:
Che Ming Ko
Che Ming Ko
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shanshan Cao;Kai-Jia Sun;Shu-Qing Li;Shuai Y.F. Liu;Wen-Jing Xing;Guang-You Qin;Che Ming Ko

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我们发展了一个相对论重离子碰撞中粲强子产生的综合合并模型,该模型包括一组广泛的s和p波强子态以及严格的能量动量守恒,保证了合并几率的提升不变性和产生的强子谱的热极限.将我们的强子化方案与一个包含了夸克胶子等离子体中重夸克的弹性和非弹性能量损失的Langevin流体力学模型相结合,成功地描述了RHIC和LHC上测量的pT积分和微分Λ c/D 0和Ds/D 0比值.我们发现,考虑介质径向流动的影响对于描述相对论重离子碰撞中观察到的增强的Λ c/D 0比是必要的.我们还发现,RHIC中Au+ Au碰撞的Λ c/D 0比比LHC中Pb+ Pb碰撞的大得令人费解,这是由于强子化时QGP径向流和粲夸克横动量谱的相互作用。我们的研究进一步表明,粲强子在介质中比在真空中有更大的尺寸。
We develop for charmed hadron production in relativistic heavy-ion collisions a comprehensive coalescence model that includes an extensive set of s and p-wave hadronic states as well as the strict energy-momentum conservation, which ensures the boost invariance of the coalescence probability and the thermal limit of the produced hadron spectrum. By combining our hadronization scheme with an advanced Langevin-hydrodynamics model that incorporates both elastic and inelastic energy loss of heavy quarks inside the dynamical quark-gluon plasma, we obtain a successful description of the p T-integrated and differential Λ c/D 0 and D s/D 0 ratios measured at RHIC and the LHC. We find that including the effect of radial flow of the medium is essential for describing the enhanced Λ c/D 0 ratio observed in relativistic heavy-ion collisions. We also find that the puzzling larger Λ c/D 0 ratio observed in Au+ Au collisions at RHIC than in Pb+ Pb collisions at the LHC is due to the interplay between the effects of the QGP radial flow and the charm quark transverse momentum spectrum at hadronization. Our study further suggests that charmed hadrons have larger sizes in medium than in vacuum.
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