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arXiv 1506.09205hep-phnucl-th
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π-ρ-Ω系统的热光子发射

Thermal photon emission from the pi-rho-omega system

Nathan P. M. Holt, Paul M. Hohler, Ralf Rapp

摘要:

我们研究了π介子、ρ介子和Ω介子组成的系统中热强子物质的热光子发射率。使用相对论动力学理论与玻恩图以及热场论在两个回路水平的速率计算。这使我们能够交叉检查我们的计算,并管理玻恩近似中对应于ω-> pi^0伽马辐射衰变的极贡献。在实施强子形状因子来解释有限尺寸修正后,我们发现所得到的光发射率与1-3 GeV能量范围内的pi rho -> pi gamma过程的现有结果相当。我们希望我们的新来源将提供一个不可忽略的贡献,总强子速率,从而提高计算的热光子谱从重离子碰撞,这可能会改善目前的直接光子数据的描述从实验。

英文摘要:

We investigate thermal photon emission rates in hot hadronic matter from a system consisting of pi, rho, and omega mesons. The rates are calculated using both relativistic kinetic theory with Born diagrams as well as thermal field theory at the two-loop level. This enables us to cross-check our calculations and to manage a pole contribution that arises in the Born approximation corresponding to the omega -> pi^0 gamma radiative decay. After implementing hadronic form factors to account for finite-size corrections, we find that the resulting photo-emission rates are comparable to existing results from pi rho -> pi gamma processes in the energy regime of 1-3 GeV. We expect that our new sources will provide a non-negligible contribution to the total hadronic rates, thereby enhancing calculated thermal photon spectra from heavy-ion collisions, which could improve the description of current direct-photon data from experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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