| Answer | Crossword Clue |
|---|---|
| MESON | Particle composed of a quark and an antiquark |
| MESON | Subatomic particle composed of one quark and one antiquark |
| upsilon | any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark |
| MESON | It's made up of a quark and an antiquark |
| charmonium | any of various elementary particles consisting of a charm quark and an antiquark |
| charmonia | CHARMONIUM, any of various elementary particles consisting of a charm quark and an antiquark |
