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arXiv 1111.5895hep-phphysics.atom-ph
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高能重原子光生电子微分截面中的电荷不对称性

Charge asymmetry in the differential cross section of high-energy e+e- photoproduction in the field of a heavy atom

R. N. Lee, A. I. Milstein, V. M. Strakhovenko

摘要:

在精确计算了重原子电场的基础上,得到了高能电子-正电子光生微分截面的准经典修正。该校正是该过程中电荷不对称性${\cal A}$的原因。当至少一个产生的粒子的横向动量比电子质量$m$大得多时,电荷不对称性可以大到百分之几十。我们还估计了$\tilde{\cal A}$对来自康普顿型图的电荷不对称性的贡献。对于重核,这种贡献可以忽略不计。对于轻核,只有当电子和正电子的动量之间的夹角为$m/ω$量级($ω$是光子能量),而两个粒子的横动量都远大于$m$时,才能注意到$\tilde{\cal A}$。

英文摘要:

First quasiclassical correction to the differential cross section of high-energy electron-positron photoproduction in the electric field of a heavy atom is obtained with the exact account of the field. This correction is responsible for the charge asymmetry ${\cal A}$ in this process. When the transverse momentum of at least one of the produced particles is much larger than the electron mass $m$, the charge asymmetry can be as large as tens percent. We also estimate the contribution $\tilde{\cal A}$ to the charge asymmetry coming from the Compton-type diagram. For heavy nuclei, this contribution is negligible. For light nuclei, $\tilde{\cal A}$ is noticeable only when the angle between the momenta of electron and positron is of order of $m/ω$ ($ω$ is the photon energy) while the transverse momenta of both particles are much larger than $m$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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