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Definition of Upsilon particle
1. Noun. (physics) Any of a number of bound states of a heavy quark and its antiquark, especially that formed from a bottom quark and an anti-bottom quark. ¹
¹ Source: wiktionary.com
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1. Noun. (physics) Any of a number of bound states of a heavy quark and its antiquark, especially that formed from a bottom quark and an anti-bottom quark. ¹
¹ Source: wiktionary.com