Xi particle
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In particle physics, Ξ (Xi) is a name given to a range of baryons with one up or down quark and two heavier quarks. They are sometimes called the cascade particles because of their unstable state, they decay rapidly into lighter particles through a chain of decays. The first discovery of the Xi particle was at Brookhaven National Laboratory in 1964.[1]
| Particle | Symbol | Makeup | Rest mass MeV/c2 |
S | C | B | Mean lifetime s |
Main decay channel |
|---|---|---|---|---|---|---|---|---|
| Xi | Ξ0 | uss | 1315 | -2 | 0 | 0 | 2.9×10-10 | Λ0 + π0 |
| Xi | Ξ- | dss | 1321 | -2 | 0 | 0 | 1.6×10-10 | Λ0 + π- |
| charmed Xi | Ξ+c | usc | 2466 | -1 | +1 | 0 | 4.4×10-13 | |
| charmed Xi | Ξ0c | dsc | 2472 | -1 | +1 | 0 | 1.1×10-13 |
[edit] References
[edit] External links
- [1] Particle Data Group listings for Xi particles
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