Impact-parameter dependence of the total probability for electromagnetic electron-positron pair production in relativistic heavy-ion collisions.
Impact-parameter dependence of the total probability for electromagnetic electron-positron pair production in relativistic heavy-ion collisions.
复制标题
DOI：
10.1103/physreva.51.1874
复制
发表时间：
1995-03
期刊：
影响因子：
--
通讯作者：
K. Hencken;D. Trautmann;G. Baur
中科院分区：
文献类型：
--
作者：
K. Hencken;D. Trautmann;G. Baur
计算了相对论重离子碰撞中最低阶电子-正电子对电磁产生的与碰撞参数相关的总几率P total（B）。我们特别研究小于康普顿波长的电子的碰撞参数，其中等效光子近似不能使用。重离子的形状因子和没有形状因子的计算进行，发现影响很小。最低阶的结果被发现违反酉性，并用于计算多对生产概率的帮助下，已经发现在早期出版物的近似泊松分布。
We calculate the impact-parameter-dependent total probability P total (b) for the electromagnetic production of electron-positron pairs in relativistic heavy-ion collisions in lowest order. We study expecially impact parameters smaller than the Compton wavelength of the electron, where the equivalent-photon approximation cannot be used. Calculations with and without a form factor for the heavy ions are done; the influence is found to be small. The lowest-order results are found to violate unitarity and are used for the calculation of multiple-pair production probabilities with the help of the approximate Poisson distribution already found in earlier publications.