Usually means: Heavy meson, bottom quark bound.
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We found 9 dictionaries that define the word upsilon particle:

General (6 matching dictionaries)
  1. upsilon particle: Oxford Learner's Dictionaries
  2. upsilon particle: American Heritage Dictionary of the English Language
  3. upsilon particle: Wiktionary
  4. upsilon particle: Dictionary.com
  5. Upsilon particle: Wikipedia, the Free Encyclopedia
  6. upsilon particle: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. upsilon particle: Encyclopedia

Medicine (1 matching dictionary)
  1. upsilon particle: Medical dictionary

Science (1 matching dictionary)
  1. Upsilon Particle: Extragalactic Astronomy

Definitions from Wiktionary (upsilon particle)

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.

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