Charm degrees of freedom in hot matter from lattice QCD

被引：2

作者：

Bazavov, A. ^{[1
,2
]}

Bollweg, D. ^{[3
,4
]}

Kaczmarek, O. ^{[5
]}

Karsch, F. ^{[5
]}

Mukherjee, Swagato ^{[3
]}

Petreczky, P. ^{[3
]}

Schmidt, C. ^{[5
]}

Sharma, Sipaz ^{[5
]}

机构：

[1] Michigan State Univ, Dept Computat Math Sci & Engn, E Lansing, MI 48824 USA

[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[3] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA

[4] RIKEN BNL Res Ctr, Brookhaven Natl Lab, Upton, NY 11973 USA

[5] Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany

来源：

PHYSICS LETTERS B | 2024年 / 850卷

基金：

美国国家科学基金会;

关键词：

QCD thermodynamics; Charm degrees of freedom; Deconfinement;

D O I：

10.1016/j.physletb.2024.138520

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the nature of charm degrees of freedom in hot strong interaction matter by performing lattice QCD calculations of the second and fourth -order cumulants of charm fluctuations, and their correlations with net baryon number, electric charge and strangeness fluctuations. We show that below the chiral crossover temperature thermodynamics of charm can be very well understood in terms of charmed hadrons. Above the chiral transition charm quarks show up as new degrees of freedom contributing to the partial charm pressure. However, up to temperatures as high as 175 MeV charmed hadron-like excitations provide a significant contribution to the partial charm pressure.

引用

页数：6

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