在RHIC和LHC中光子-核子碰撞产生的大横动量双轻子

Large Transverse Momentum Dilepton Production from the Photon-nucleon Collisions at RHIC and LHC

研究了RHIC和LHC能区的Au-Au和Pb-Pb周边重离子碰撞中,来自光子-核子相互作用产生的大横动量双轻子。利用微扰QCD参数化和Weizs?cker-Williams近似计算了双轻子的产率。经过与领头阶和碎裂过程的双轻子产生数值计算结果相比较,光-核碰撞过程产生的大横动量双轻子在RHIC能区是可忽略的。但是在LHC能区,光-核碰撞在大横动量区域是周边重离子碰撞的一个重要的双轻子源。

We study the large transverse momentum dilepton produced by the photon-nucleon interactions in the peripheral Au-Au collisions at RHIC and Pb-Pb collisions at LHC.We calculate the dilepton production yield by using the perturbative QCD factorization approach and the Weizs?cker-Williams approximation.The numerical results indicate that the photon-nucleon collision processes is negligible by comparing with the conventional large transverse momentum dilepton production at RHIC energies.However,in the large transverse momentum region,the photon-nucleon collision could be an important large transverse momentum dilepton source in the peripheral heavy ion collisions at LHC.