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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 D meson ： ウィキペディア英語版 D meson The D mesons are the lightest particle containing charm quarks. They are often studied to gain knowledge on the weak interaction.〔(D Meson )〕 The strange D mesons (Ds) were called the "F mesons" prior to 1986. ==Overview== The D mesons were discovered in 1976 by the Mark I detector at the Stanford Linear Accelerator Center.〔http://www.kudryavtsev.staff.shef.ac.uk/phy466/charmed-mesons_files/charmed-mesons.ppt〕 Since the D mesons are the lightest mesons containing a single charm quark (or antiquark), they must change the charm (anti)quark into an (anti)quark of another type to decay. Such transitions violate the internal charm quantum number, and can take place only via the weak interaction. In D mesons, the charm quark preferentially changes into a strange quark via an exchange of a W particle, therefore the D meson preferentially decays into s and s.〔 In November 2011, researchers at the LHCb experiment at CERN reported (3.5 sigma significance) that they have observed a direct CP violation in the neutral D meson decay, possibly beyond the Standard Model.〔(New Physics at LHC? An Anomaly in CP Violation : Cosmic Variance )〕 This result builds on earlier measurements at the CDF, Belle, and BaBAR experiments. 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「D meson」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.