相对论重离子碰撞中初态核效应对直接光子谱的影响

Shadowing Effects in the Direct Photon Production in Heavy-ion Collisions

在次领头阶部分子模型的基础上,通过采用不同的初态核效应参数化因子,研究了相对论重离子碰撞中初态核效应对直接光子谱的影响,计算了p+A和A+A对心碰撞中直接光子的核修正因子,这对研究相对论重离子碰撞寻找夸克胶子等离子体非常重要.

Within a next-to-leading order perturbative QCD parton model, nuclear shadowing effects are investi- gated in productions of direct photons in heavy ion collisions at RHIC energy. The transverse momentum depen- dence of the nuclear modification factors is presented in p＋A and A＋A collisions to distinguish different parameter- izations for nuclear shadowing effects. Our numerical results show that in central Au＋Au collisions the nuclear mod- ification factor for direct photons is a powerful tool to discriminate different parameterizations for patton distribu- tions.