| Answer | Crossword Clue |
|---|---|
| MESON | Particle composed of a quark and an antiquark |
| MESON | Subatomic particle composed of one quark and one antiquark |
| MESON | It's made up of a quark and an antiquark |
| MESON | A quark and an antiquark |
| UPSILON | Meson made up of a bottom quark and its antiquark |
| MESON | Quark-plus-antiquark particle |
