Charm mass effects in bulk channel correlations
| Autor: | Burnier, Y., Laine, M. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | JHEP 1311 (2013) 012 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/JHEP11(2013)012 |
| Popis: | 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. Comment: 24 pages. v2: clarifications added, published version |
| Databáze: | arXiv |
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