HIGH-ENERGY PHOTONS FROM QUARK-GLUON PLASMA VERSUS HOT HADRONIC GAS

被引：449

作者：

KAPUSTA, J ^{[1
]}

LICHARD, P ^{[1
]}

SEIBERT, D ^{[1
]}

机构：

[1] UNIV MINNESOTA,INST THEORET PHYS,MINNEAPOLIS,MN 55455

来源：

PHYSICAL REVIEW D | 1991年 / 44卷 / 09期

关键词：

D O I：

10.1103/PhysRevD.44.2774

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Photons in the energy range of about one-half to several GeV have been proposed as a signal of the formation of a quark-gluon plasma in high-energy collisions. To lowest order the thermal emission rate is infrared divergent for massless quarks, but we regulate this divergence using the resummation technique of Braaten and Pisarski. Photons can also be produced in the hadron phase. We find that the dominant contribution comes from the reactions pi-pi --> rho-gamma and pi-rho --> pi-gamma; the decays omega --> pi-gamma and rho --> pi-pi-gamma are also significant. Comparing the thermal emission rates at a temperature T = 200 MeV we conclude that the hadron gas shines just as brightly as the quark-gluon plasma.

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收藏

页码：2774 / 2788

页数：15

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