Brandt, B. B. and Francis, A. and Laine, M. and Meyer, H. B. (2014) A relation between screening masses and real-time rates. JOURNAL OF HIGH ENERGY PHYSICS (5): 117. ISSN 1029-8479,
Full text not available from this repository. (Request a copy)Abstract
Thermal screening masses related to the conserved vector current are determined for the case that the current carries a non-zero Matsubara frequency, both in a weak-coupling approach and through lattice QCD. We point out that such screening masses are sensitive to the same infrared physics as light-cone real-time rates. In particular, on the perturbative side, the inhomogeneous Schrodinger equation determining screening correlators is shown to have the same general form as the equation implementing LPM resummation for the soft-dilepton and photon production rates from a hot QCD plasma. The static potential appearing in the equation is identical to that whose soft part has been determined up to NLO and on the lattice in the context of jet quenching. Numerical results based on this potential suggest that screening masses overshoot the free results (multiples of 2 pi T) more strongly than at zero Matsubara frequency. Four-dimensional lattice simulations in two-flavour QCD at temperatures of 250 and 340 MeV confirm the non-static screening masses at the 10% level. Overall our results lend support to studies of jet quenching based on the same potential at T greater than or similar to 250 MeV.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GAUGE-THEORIES; LATTICE QCD; FREE-ENERGY; IMPROVEMENT; ORDER; Thermal Field Theory; Quark-Gluon Plasma; Resummation; Lattice QCD |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Nov 2019 14:27 |
| Last Modified: | 06 Nov 2019 14:27 |
| URI: | https://pred.uni-regensburg.de/id/eprint/10163 |
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