翻訳と辞書 Words near each other ・ Michel Olçomendy ・ Michel Onfray ・ Michel Ordener ・ Michel Oreste ・ Michel Orso ・ Michel Ory ・ Michel Ostyn ・ Michel Ouellet ・ Michel Pablo ・ Michel Pageaud ・ Michel Pagel ・ Michel Pagliaro ・ Michel Pagé ・ Michel Pajon ・ Michel Palmié ・ Michel parameters ・ Michel Parent ・ Michel Parizeau ・ Michel Particelli d'Emery ・ Michel Parès ・ Michel Pastor ・ Michel Pastoureau ・ Michel Pastre ・ Michel Paul Guy de Chabanon ・ Michel Pavon ・ Michel Paysant ・ Michel Pech ・ Michel Peissel ・ Michel Pensée ・ Michel Perrault Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Michel parameters ： ウィキペディア英語版 Michel parameters The Michel parameters, usually denoted by $\backslash rho,\; \backslash eta,\; \backslash xi$ and $\backslash delta$, are four parameters used in describing the phase space distribution of leptonic decays of charged leptons, $l\_^-\backslash rightarrow\; l\_^\backslash nu\_\backslash bar,\; \backslash quad\; \backslash eta=0,\; \backslash quad\; \backslash xi=1,\; \backslash quad\; \backslash xi\backslash delta=.$ Precise measurements of energy and angular distributions of the daughter leptons in decays of polarized muons and tau leptons are so far in good agreement with these predictions of the Standard Model. ==Muon decay== Let us consider the decay of the positive muon: :$\backslash mu^+\backslash to\; e^+\; +\; \backslash nu\_e\; +\; \backslash bar\backslash nu\_\backslash mu.$ In the muon rest frame, energy and angular distributions of the positrons emitted in the decay of a polarised muon expressed in terms of Michel parameters are the following, neglecting electron and neutrino masses and the radiative corrections: :$\backslash frac\; \backslash sim\; (3-3x)\; +\; \backslash frac\backslash rho\; (4x-3)\; +\; P\_\backslash xi\backslash cos\backslash theta$ (), where $P\_$ is muon polarisation, $x=E\_e/E\_e^$, and $\backslash theta$ is the angle between muon spin direction and positron momentum direction.〔 〕 For the decay of the negative muon, the sign of the term containing $cos\backslash theta$ should be inverted. For the decay of the positive muon, the expected decay distribution for the Standard Model values of Michel parameters is :$\backslash frac\; \backslash sim\; x^2(-\; P\_\backslash cos\backslash theta(1-2x)).$ Integration of this expression over electron energy gives the angular distribution of the daughter positrons: :$\backslash frac\; \backslash sim\; 1\; +\; \backslash fracP\_\backslash cos\backslash theta.$ The positron energy distribution integrated over the polar angle is :$\backslash frac\; \backslash sim\; (3x^2-2x^3).$ 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「Michel parameters」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.