金一金碰撞中由双光子过程产生的软双轻子

原子核物理评论 , 2012, 29(3): 238-243.

金一金碰撞中由双光子过程产生的软双轻子

傅永平 ^1, , 李云德 ^2,

1.云南大学物理系,云南昆明,650091

2.云南大学物理系,云南昆明,650091

基金项目: 国家自然科学基金资助项目(10665003,11065010)

关键词：双光子相互作用 , 相对论重离子碰撞 , 双轻子产生

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

Keywords： two-photon interaction relativistic heavy ion collision , dilepton production ,

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。

The production of the low transverse momentum （Pv） dileptons induced by semi-cohe rent two-photon interaction is calculated. The numerical results are compared with the experimen tal data from the PHENIX, the modification of the semi-coherent two-photon interaction is re markable in the low transverse momentum region for different mass bins. We find that the contri bution of semi-coherent two-photon processes is more evident in the large dilepton mass region.

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