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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 Tribimaximal mixing ： ウィキペディア英語版 Tribimaximal mixing Tribimaximal mixing〔 〕 is a specific postulated form for the Pontecorvo–Maki–Nakagawa–Sakata (PMNS) lepton mixing matrix ''U''. Tribimaximal mixing is defined by a particular choice of the matrix of moduli-squared of the elements of the PMNS matrix as follows: :$\backslash begin$ |U_|^2 & |U_|^2 & |U_|^2 \\ |U_|^2 & |U_|^2 & |U_|^2 \\ |U_|^2 & |U_|^2 & |U_|^2 \end = \begin \frac & \frac & 0 \\ \frac & \frac & \frac \\ \frac & \frac & \frac \end. The tribimaximal mixing form was compatible with all verified neutrino oscillation experiments until recently,〔 〕 and may be used as a zeroth-order approximation to more general forms for the PMNS matrix e.g.〔 〕〔 〕 which are also consistent with the data. In the PDG〔 convention for the PMNS matrix, tribimaximal mixing may be specified in terms of lepton mixing angles as follows: :$$ \begin \theta_=\sin^ \left(}}\right)\simeq 35.3^ & \theta_=45^\\ \theta_=0 & \delta=0. \end The above prediction has been falsified experimentally, because ''θ''13 was found to be large.〔 〕 A large value of ''θ''13 has been foreseen in certain theoretical schemes that were put forward before tribimaximal mixing and that supported a large solar mixing, before it was confirmed experimentally 〔 〕〔 〕 (these theoretical schemes do not have a special name, but for the reasons explained above, they could be called pre-tribimaximal or also non-tribimaximal). This situation is not new: also in the 1990s, the solar mixing angle was supposed to be small by most theorists, until KamLAND proved the contrary to be true. ==Explanation of name== The name ''tribimaximal'' reflects the commonality of the tribimaximal mixing matrix with two previously proposed specific forms for the PMNS matrix, the trimaximal〔 〕 and bimaximal〔 〕 mixing schemes, both now ruled out by data. In tribimaximal mixing,〔 the $\backslash nu\_2$ neutrino mass eigenstate is said to be "trimaximally mixed" in that it consists of a uniform admixture of $\backslash nu\_e$, $\backslash nu\_$ and $\backslash nu\_$ flavour eigenstates, i.e. maximal mixing among all three flavour states. The $\backslash nu\_3$ neutrino mass eigenstate, on the other hand, is "bimaximally mixed" in that it comprises a uniform admixture of only two flavour components, i.e. $\backslash nu\_$ and $\backslash nu\_$ maximal mixing, with effective decoupling of the $\backslash nu\_e$ from the $\backslash nu\_3$, just as in the original bimaximal scheme.〔 〔 〕 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「Tribimaximal mixing」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.