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arXiv 2008.00116hep-phnucl-th
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热光子的重子源

Baryonic Sources of Thermal Photons

Nathan P. M. Holt, Ralf Rapp

摘要:

强子物质中光子和双轻子的热辐射对于理解高能重离子碰撞中的电磁辐射谱具有重要作用。特别是,重子和反重子被发现是电磁辐射的强催化剂,即使在重子化学势很小的对撞机能量下。在这里,我们进行了一个系统的分析$π$ -和$ω$ -介子诱导的反应了一个大的重子状态。的相互作用是基于有效的强子拉格朗日参数的定量约束的经验信息,从真空衰变分支和散射数据,规范不变性保持适当的正则化程序。热发射率计算使用动力学理论,但可以直接比较到以前的计算使用强子多体理论。与文献中现有计算的比较表明,我们新确定的贡献是相当显着的。

英文摘要:

Thermal radiation of photons and dileptons from hadronic matter plays an essential role in understanding electromagnetic emission spectra in high-energy heavy-ion collisions. In particular, baryons and anti-baryons have been found to be strong catalysts for electromagnetic radiation, even at collider energies where the baryon chemical potential is small. Here, we conduct a systematic analysis of $π$- and $ω$-meson-induced reactions off a large set of baryon states. The interactions are based on effective hadronic Lagrangians where the parameters are quantitatively constrained by empirical information from vacuum decay branchings and scattering data, and gauge invariance is maintained by suitable regularization procedures. The thermal emission rates are computed using kinetic theory but can be directly compared to previous calculations using hadronic many-body theory. The comparison to existing calculations in the literature reveals our newly identified contributions to be rather significant.

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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