Nonperturbative effects on radiative energy loss of heavy quarks

	Nonperturbative effects on radiative energy loss of heavy quarks
	Liu, Shuai Y F 1; Rapp, Ralf 1
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2020
卷号	2020 期号:8
ISSN号	1029-8479
英文摘要	The radiative energy loss of fast partons traveling through the quark-gluon plasma (QGP) is commonly studied within perturbative QCD (pQCD). Nonperturbative (NP) effects, which are expected to become important near the critical temperature, have been much less investigated. Here, we utilize a recently developed T -matrix approach to incorporate NP effects for gluon emission off heavy quarks propagating through the QGP. We set up four cases that contain, starting from a Born diagram calculation with color- Coulomb interaction, an increasing level of NP components, by subsequently including (remnants of ) confining interactions, resummation in the heavy-light scattering amplitude, and off-shell spectral functions for both heavy and light partons. For each case we compute the power spectra of the emitted gluons, heavy-quark transport coefficients (drag and transverse-momentum broadening, (q) over cap), and the path-length dependent energy loss within a QGP brick at fixed temperature. Investigating the differences in these quantities between the four cases illustrates how NP mechanisms affect gluon radiation processes. While the baseline perturbative processes experience a strong suppression of soft radiation due to thermal masses of the emitted gluons, confining interactions, ladder resummations and broad spectral functions (re-)generate a large enhancement toward low momenta and low temperatures. For example, for a 10 GeV charm quark at 200 MeV temperature, they enhance the transport coefficients by up to a factor of 10, while the results smoothly converge to perturbative results at sufficiently hard scales.
资助项目	[U.S. National Science Foundation (NSF)]
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/136971]
专题	中国科学院近代物理研究所
作者单位	1.Texas A&M University System 2.Institute of Modern Physics, Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Liu, Shuai Y F,Rapp, Ralf. Nonperturbative effects on radiative energy loss of heavy quarks[J]. JOURNAL OF HIGH ENERGY PHYSICS,2020,2020(8).
APA	Liu, Shuai Y F,&Rapp, Ralf.(2020).Nonperturbative effects on radiative energy loss of heavy quarks.JOURNAL OF HIGH ENERGY PHYSICS,2020(8).
MLA	Liu, Shuai Y F,et al."Nonperturbative effects on radiative energy loss of heavy quarks".JOURNAL OF HIGH ENERGY PHYSICS 2020.8(2020).