标题： 夸克-胶子等离子体中增强的光子产率：有限寿命效应 显示英文标题

标题： Enhanced photon production from quark-gluon plasma: Finite-lifetime effect

摘要： 从有限寿命的热化夸克-胶子等离子体中产生的光子在非平衡形式下直接在实时中进行研究，该形式包括离壳（能量不守恒）效应。 在最低阶我们发现，温度 T ~ 200 MeV 和寿命 t ~ 10-20 fm/c 的夸克-胶子等离子体产生的直接光子通过离壳（反）夸克辐射 q(\bar{q})->q(\bar{q})\gamma 显著增强。 这种非平衡有限寿命效应的产率在能量 E > 2 GeV 范围内超过从更高阶平衡速率计算得到的产率，并且在 E >> T 时按幂律下降。 显示英文摘要

摘要： Photon production from a thermalized quark-gluon plasma of finite lifetime is studied directly in real time with a nonequilibrium formulation that includes off-shell (energy nonconserving) effects. To lowest order we find that production of direct photons form a quark-gluon plasma of temperature T ~ 200 MeV and lifetime t ~ 10-20 fm/c is strongly enhanced by off-shell (anti)quark bremsstrahlung q(\bar{q})->q(\bar{q})\gamma. The yield from this nonequilibrium finite-lifetime effect dominates over those obtained from higher order equilibrium rate calculations in the range of energy E > 2 GeV and falls off with a power law for E >> T.