金-金碰撞中由双光子过程产生的软双轻子(英文)

Soft Dilepton Production in Au-Au Collisions by Twophoton Processes

摘要: 计算了由准相干双光子相互作用导致的低横动量双轻子产生。对于不同的质量范围，准相干双光子相互作用在低横动量区域都很重要。将计算结果与相对论重离子对撞机RHIC的PHENIX实验数据进行比较，发现随着双轻子不变质量的增加，准相干双光子过程的修正作用会更加明显。

Abstract: The production of the low transverse momentum (P_T) dileptons induced by semicohe rent twophoton interaction is calculated. The numerical results are compared with the experimental data from the PHENIX， the modification of the semicoherent twophoton interaction is remarkable in the low transverse momentum region for different mass bins. We find that the contribution of semicoherent twophoton processes is more evident in the large dilepton mass region.