Heavy quark diffusion in an overoccupied gluon plasma

Journal of High Energy Physics

T. Lappi¹  J. Peuron²  K. Boguslavski³  A. Kurkela⁴ 

[1] Department of Physics, University of Jyväskylä, P.O. Box 35, 40014, Jyväskylä, Finland;Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland;European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, Strada delle Tabarelle 286, I-38123, Villazzano, TN, Italy;Institute for Theoretical Physics, Technische Universität Wien, Wiedner Hauptstraße 8-10/136, 1040, Vienna, Austria;Theoretical Physics Department, CERN, Geneva, Switzerland;Faculty of Science and Technology, University of Stavanger, Postboks 8600, Forus, 4036, Stavanger, Norway;

关键词: Lattice QCD;    Quark-Gluon Plasma;    Heavy Quark Physics;   

DOI  :  10.1007/JHEP09(2020)077

来源: Springer

【 摘 要 】

We extract the heavy-quark diffusion coefficient κ and the resulting momentum broadening 〈p2〉 in a far-from-equilibrium non-Abelian plasma. We find several features in the time dependence of the momentum broadening: a short initial rapid growth of 〈p2〉, followed by linear growth with time due to Langevin-type dynamics and damped oscillations around this growth at the plasmon frequency. We show that these novel oscillations are not easily explained using perturbative techniques but result from an excess of gluons at low momenta. These oscillation are therefore a gauge invariant confirmation of the infrared enhancement we had previously observed in gauge-fixed correlation functions. We argue that the kinetic theory description of such systems becomes less reliable in the presence of this IR enhancement.

【 授权许可】

CC BY