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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 NMSSM ： ウィキペディア英語版 Next-to-Minimal Supersymmetric Standard Model In particle physics, NMSSM is an acronym for Next-to-Minimal Supersymmetric Standard Model. 〔 〕〔 〕〔 〕〔 〕〔 〕 It is a supersymmetric extension to the Standard Model that adds an additional singlet chiral superfield to the MSSM and can be used to dynamically generate the $\backslash mu$ term, solving the $\backslash mu$-problem. Articles about the NMSSM are available for review.〔 〕〔 〕 The Minimal Supersymmetric Standard Model does not explain why the $\backslash mu$ parameter in the superpotential term $\backslash mu\; H\_u\; H\_d$ is at the electroweak scale. The idea behind the Next to Minimal Supersymmetric Standard Model is to promote the $\backslash mu$ term to a gauge singlet, chiral superfield $S$. Note that the scalar superpartner of the singlino $S$ is denoted by $\backslash hat$ and the spin-1/2 singlino superpartner by $\backslash tilde$ in the following. The superpotential for the NMSSM is given by :$W\_\}+\backslash lambda\; S\; H\_u\; H\_d\; +\; \backslash frac\; S^3$ where $W\_$ getting a vacuum-expectation value $\backslash langle\; \backslash hat\; \backslash rangle$, that is, we have :$\backslash mu\_\; \backslash rangle$ Without the $\backslash kappa$ term the superpotential would have a U(1)' symmetry, so-called Peccei–Quinn symmetry; see Peccei–Quinn theory. This additional symmetry would alter the phenomenology completely. The role of the $\backslash kappa$ term is to break this U(1)' symmetry. The $\backslash kappa$ term is introduced trilinear such that $\backslash kappa$ is dimensionless. However there remains a discrete $\backslash mathbb\_3$ symmetry, which is moreover broken spontaneously.〔 Translated in 〕 In principle this leads to the domain wall problem. Introducing additional, but suppressed terms, the $\backslash mathbb\_3$ symmetry can be broken without changing phenomenology at the electroweak scale.〔 〕 It is assumed that the domain wall problem is circumvented in this way without any modifications except far beyond the electroweak scale. Also alternative models have been proposed which solve the $\backslash mu$-problem of the MSSM. One idea is to keep the $\backslash kappa$ term in the superpotential and take the U(1)' symmetry into account. Assuming this symmetry to be local an additional $Z\text{'}$ gauge boson is predicted in this model, called UMSSM . == Phenomenology == Due to the additional singlet $S$ the NMSSM alters in general the phenomenology of both the Higgs sector and the neutralino sector compared to the MSSM. 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「Next-to-Minimal Supersymmetric Standard Model」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.