upsilon particle

English - English

Definition of upsilon particle in English English dictionary

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

An electrically neutral meson having a mass 18,513 times that of the electron and a mean lifetime of approximately 8.0 × 10- seconds

Hyphenation

up·si·lon par·ti·cle