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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 Form factor (quantum field theory) ： ウィキペディア英語版 Form factor (quantum field theory) In mathematical physics, in particular in effective field theory, a form factor is a function that gives the properties of a certain particle interaction without including all of the underlying physics. It is measured experimentally when a theoretical calculation is unavailable or too difficult—see experimental particle physics. ==Photon-nucleon example== For example, at low energies the interaction of a photon with a nucleon is a very complicated calculation involving interactions between the photon and a sea of quarks and gluons, and often the calculation cannot be done. Often in this context, form factors are also called "structure functions", since they can be used to describe the structure of the nucleon. However the general form of the interaction is known, : $\backslash varepsilon\_\backslash mu\; \backslash bar\backslash left(\backslash alpha(q^2)\; \backslash gamma^\backslash mu\; +\; \backslash beta(q^2)\; q^\backslash mu\; +\; \backslash kappa(q^2)\; \backslash sigma^\; q\_\backslash nu\; \backslash right)N\; \backslash ,$ where $q^\backslash mu$ represents the photon momentum (equal to ''E''/''c'', where ''E'' is the energy of the photon). The three functions: $\backslash alpha,\; \backslash beta\; ,\; \backslash kappa$ are the form factors for this interaction, they can be measured experimentally, and then the three effective vertices can be used to perform calculations that would otherwise be too difficult. 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「Form factor (quantum field theory)」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.