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arXiv 1303.0653hep-ph
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$e^+e^-$湮灭中的末态库仑相互作用和阈值附近对产生的不对称性

Final state Coulomb interaction and asymmetry of pair production close to threshold in $e^+e^-$ annihilation

V. F. Dmitriev, A. I. Milstein

摘要:

我们研究了$d$波对$e^+e^-$湮灭到接近阈值的带电轻子或核子对的截面的贡献。与文献中所接受的观点相反,由于库仑末态相互作用,即使在产生粒子的相对速度为零时,这种贡献也不会消失。这导致在阈值处角分布的非零不对称性。虽然不对称性的值很小,但观察这种效应并非毫无希望。

英文摘要:

We investigate a contribution of the $d$ wave to the cross section of $e^+e^-$ annihilation to the pair of charged leptons or nucleons close to threshold of the process. In contrast to the point of view accepted in literature, due to the Coulomb final state interaction this contribution does not vanish even at zero relative velocity of produced particles. This results in the nonzero asymmetry in angular distribution at threshold. Though value of the asymmetry is small, observation of this effect is not hopeless.

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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