The thermal photon emissivity at the QCD chiral crossover from imaginary momentum correlators

2024/01/11 by Ardit Krasniqi, Krasniqi, Ardit, Marco Cè +9 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2401.05951

openalex publication_date 2024/01/11 · openalex created_date 2024/01/13 · openalex updated_date 2026/08/04

Abstract

The thermal photon emissivity at the QCD chiral crossover is investigated using imaginary momentum correlators. These have been measured on a newly generated 20 × 96³ lattice-QCD ensemble with O(a)-improved Wilson quarks and physical up, down and strange quark masses at a temperature T=154 MeV near the pseudo-critical temperature. In order to realize the photon on-shell condition, the spatially transverse Euclidean correlators have to be evaluated at imaginary spatial momenta. Employing a bounding method, we present a preliminary result on the quantity H_E(ω₁), which corresponds to an energy-moment of the photon spectral function σ(ω)/ω defined by the weight function 1/(ω²+ω_n²), the ω_n being integer multiples of 2πT.

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