Massive vector current correlator in thermal QCD
Abstract
We present an NLO analysis of the massive vector current correlator at temperatures above a few hundred MeV. The physics of this correlator originates from a transport peak, related to heavy quark diffusion, and from the quark-antiquark threshold, related to quarkonium physics. In the bottom case both can be studied with separate effective theories, but for charm these may not be accurate, so a study within the full theory is needed. Working in imaginary time, the NLO correlator can be computed in unresummed perturbation theory; comparing with lattice data, we find good agreement. Subsequently we inspect how non-perturbative modifications of the transport peak would affect the imaginary-time correlator. The massive NLO quark-number susceptibility is also contrasted with numerical measurement.
Cite
@article{arxiv.1210.1064,
title = {Massive vector current correlator in thermal QCD},
author = {Y. Burnier and M. Laine},
journal= {arXiv preprint arXiv:1210.1064},
year = {2015}
}
Comments
28 pages. v2: references and clarifications added, published version