英语词汇“upsilon meson”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	upsilon meson
释义	upsilon meson upsilon meson n. An electrically neutral meson consisting of a bottom quark and a bottom antiquark and having a mass 18,513 times that of the electron and a mean lifetime of about 1.2 × 10^-20 second. EncyclopediaSeeupsilon particle
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