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arXiv 1202.3679nucl-thhep-phnucl-ex
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光子和双轻子在量子阱中的产生

Production of Photons and Dileptons in the Glasma

Mickey Chiu, Thomas K. Hemmick, Vladimir Khachatryan, Andrey Leonidov, Jinfeng Liao, Larry McLerran

摘要:

利用PHENIX实验数据,研究了重离子碰撞中预平衡碰撞阶段光子和双轻子的产生,并讨论了其意义。我们发现,这种电磁辐射的测量分布,虽然有一些功能没有很好地理解,如果假设完全产生于热化的夸克-胶子等离子体,有一些定性的功能,可能会被描述后,包括从热化等离子体的影响。的形状和中心的依赖性的横向动量谱的所谓的“热光子”得到了很好的描述。中等质量双轻子的质量和横动量依赖性也与我们的估计一致。过量的双轻子(在低到中等质量区域)产生的低横动量暗示着玻色凝聚的排放。我们还预测了双轻子产生的中心依赖性。讨论了当前方法的优点和未来的改进。

英文摘要:

We study the production of photons and dileptons during the pre-equilibrium Glasma stage in heavy ion collisions and discuss the implications in light of the PHENIX data. We find that the measured distributions of such electromagnetic emissions, while having some features not well understood if hypothesized to entirely arise from a thermalized Quark-Gluon Plasma, have some qualitative features that might be described after including effects from a thermalizing Glasma. The shape and centrality dependence of the transverse momentum spectra of the so-called "thermal photons" are well described. The mass and transverse momentum dependence of intermediate mass dileptons also agree with our estimates. The low transverse momenta from which the excessive dileptons (in low to intermediate mass region) arise is suggestive of emissions from a Bose condensate. We also predict the centrality dependence of dilepton production. Uncertainties in the current approach and improvements in the future are discussed.

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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