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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bhabha scattering ： ウィキペディア英語版 Bhabha scattering In quantum electrodynamics, Bhabha scattering is the electron-positron scattering process: ::$e^+\; e^-\; \backslash rightarrow\; e^+\; e^-$ There are two leading-order Feynman diagrams contributing to this interaction: an annihilation process and a scattering process. Bhabha scattering is named after the Indian physicist Homi J. Bhabha. The Bhabha scattering rate is used as a luminosity monitor in electron-positron colliders. ==Differential cross section== To leading order, the spin-averaged differential cross section for this process is ::$\backslash frac\; =\; \backslash frac\; \backslash left(\; u^2\; \backslash left(\; \backslash frac\; +\; \backslash frac\; \backslash right)^2\; +\; \backslash left(\; \backslash frac\; \backslash right)^2\; +\; \backslash left(\; \backslash frac\; \backslash right)^2\; \backslash right)\; \backslash ,$ where ''s'',''t'', and ''u'' are the Mandelstam variables, $\backslash alpha$ is the fine-structure constant, and $\backslash theta$ is the scattering angle. This cross section is calculated neglecting the electron mass relative to the collision energy and including only the contribution from photon exchange. This is a valid approximation at collision energies small compared to the mass scale of the Z boson, about 91 GeV; at higher energies the contribution from Z boson exchange also becomes important. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bhabha scattering」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.