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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 Bottomness ： ウィキペディア英語版 Bottomness In physics, bottomness (symbol ''B''′) also called beauty, is a flavour quantum number reflecting the difference between the number of bottom antiquarks (''n'') and the number of bottom quarks (''n'') that are present in a particle: :$B^\backslash prime\; =\; -(n\_b\; -\; n\_)$ Bottom quarks have (by convention) a bottomness of −1 while bottom antiquarks have a bottomness of +1. The convention is that the flavour quantum number sign for the quark is the same as the sign of the electric charge (symbol ''Q'') of that quark (in this case, Q = −). As with other flavour-related quantum numbers, bottomness is preserved under strong and electromagnetic interactions, but not under weak interactions. For first-order weak reactions, it holds that $\backslash Delta\; B^\backslash prime\; =\; \backslash plusmn\; 1$. This term is rarely used. Most physicists simply refer to "the number of bottom quarks" and "the number of bottom antiquarks". ==Further reading== * de:Flavour#Quark-Flavours 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「Bottomness」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.