Charm mass effects in bulk channel correlations

Burnier, Yannis; Laine, Mikko Sakari (2013). Charm mass effects in bulk channel correlations. Journal of High Energy Physics, 2013(11), pp. 1-21. Springer 10.1007/JHEP11(2013)012

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The bulk viscosity of thermalized QCD matter at temperatures above a few hundred MeV could be significantly influenced by charm quarks because their contribution arises four perturbative orders before purely gluonic effects. In an attempt to clarify the challenges of a lattice study, we determine the relevant imaginary-time correlator (of massive scalar densities) up to NLO in perturbation theory, and compare with existing data. We find discrepancies much larger than in the vector channel; this may hint, apart from the importance of taking a continuum limit, to larger non-perturbative effects in the scalar channel. We also recall how a transport peak related to the scalar density spectral function encodes non-perturbative information concerning the charm quark chemical equilibration rate close to equilibrium.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Theoretical Physics
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Burnier, Yannis and Laine, Mikko Sakari

Subjects:

500 Science > 530 Physics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

05 Jun 2014 16:21

Last Modified:

17 Sep 2015 11:08

Publisher DOI:

10.1007/JHEP11(2013)012

BORIS DOI:

10.7892/boris.42209

URI:

https://boris.unibe.ch/id/eprint/42209

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