upsilon particle


upsilon particle

noun

  1. the 20th letter of the Greek alphabet (Υ, υ).
  2. the vowel sound represented by this letter.
  3. Also called upsilon particle. Physics. any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Symbol: Υ, υ

noun

  1. the 20th letter in the Greek alphabet (Υ, υ), a vowel, transliterated as y or u

“20th letter of the Greek alphabet,” 1640s, from Greek u psilon, literally “a mere (or bare) ‘u;’ ” so called in contradistinction to the diphthongs -oi-, -ei-, which are pronounced exactly like upsilon.

n.

  1. The 20th letter of the Greek alphabet.

  1. An electrically neutral meson having a mass 18,513 times that of the electron and a mean lifetime of approximately 8.0 X 10-20 seconds. See Table at subatomic particle.

Leave a Reply

Your email address will not be published. Required fields are marked *

46 queries 1.059