Probing how bright the quark-gluon plasma glows in lattice QCD

IF 5.3 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review D Pub Date : 2025-10-10 DOI:10.1103/8dq9-q62p

Ardit Krasniqi, Marco Cè, Tim Harris, Renwick J. Hudspith, Harvey B. Meyer

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Abstract

Determining the spectrum of photons emitted by the quark-gluon plasma nonperturbatively remains an open computational challenge. In this paper, we calculate two moments of that spectrum at a tem-perature T≈254MeV, employing lattice QCD with two flavors of O(a)-improved Wilson fermions, without facing an inverse problem. Our central value for the difference of these two moments, which is sensitive to photon energies ω≳πT, is lower than, but compatible with that obtained by integrating the leading-order weak-coupling photon spectrum. This study informs the “direct photon puzzle” in heavy-ion collision phenomenology, where it has proved difficult to simultaneously explain the yield and azimuthal anisotropy of photons not originating from final-state hadronic decays.

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探测晶格QCD中夸克-胶子等离子体发光的亮度

确定由夸克-胶子等离子体发射的光子光谱的非摄动仍然是一个开放的计算挑战。在本文中，我们在T≈254MeV的温度下，使用两种O(a)-改进Wilson费米子的晶格QCD计算了该光谱的两个矩，而没有遇到逆问题。这两个矩差的中心值对光子能量ω ω πT很敏感，小于前阶弱耦合光子谱积分得到的中心值，但与之一致。这项研究揭示了重离子碰撞现象学中的“直接光子难题”，在重离子碰撞现象学中，事实证明很难同时解释非最终态强子衰变产生的光子的产率和方位各向异性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review D 物理-天文与天体物理

CiteScore

9.20

自引率

36.00%

发文量

审稿时长

2 months

期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.