2014/04/30 by B. B. Brandt, B.B. Brandt, A. Francis +3
Physics and Astronomy · #Context (archaeology) #Current (fluid) #High-Energy Particle Collisions Research #Infrared #Lattice (music) #Lattice QCD #Master equation #Perturbative QCD #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Resummation #hep-lat #hep-ph
paper · pdf · doi:10.1007/jhep05(2014)117
published as JHEP 1405 (2014) 117 · 32 pages. v2: clarifications added, typos corrected; published version
openalex publication_date 2014/05/01 · arxiv created 2014/05/28 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Schrödinger 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 2πT) 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 ≳ 250 MeV.