| Clue | Source | Date |
|---|---|---|
| A subatomic particle with a mass equal to or greater than that of a proton | ||
| Subatomic particle | The Times Concise | 15 Sep 2020 |
| Elementary particle | Thomas Joseph | 01 Jul 2020 |
| Peer round unknown atomic particle | The Telegraph Toughie | 14 Feb 2018 |
| Subatomic particle made of three quarks | ||
| Subatomic particle made of three quarks |