| Upsilon | |
| Num Types: | 1 |
| Statistics: | Bosonic |
| Group: | Mesons |
| Interaction: | Strong, weak, electromagnetic, gravity |
| Antiparticle: | Self |
| Discovered: | E288 experiment (1977) |
| Electric Charge: | 0 e |
| Spin: | 1 |
| Isospin: | 0 |
| Hypercharge: | 0 |
| Parity: | -1 |
| C Parity: | -1 |
The Upsilon meson is a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle. It was discovered by the E288 experiment team, headed by Leon Lederman, at Fermilab in 1977, and was the first particle containing a bottom quark to be discovered because it is the lightest that can be produced without additional massive particles. It has a lifetime of and a mass about in the ground state.