Encyclopedia of Chemistry

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]

The Ξ^-_b particle is also known as the cascade B particle and contains quarks from all three families.

References

1. ^ http://hyperphysics.phy-astr.gsu.edu/hbase/particles/xi.html
2. ^ http://arxiv.org/PS_cache/arxiv/pdf/0706/0706.1690v2.pdf
3. ^ Fermilab physicists discover "triple-scoop" baryon. Fermilab (2007-06-13). Retrieved on 2007-06-14.
4. ^ Back-to-Back b Baryons in Batavia. Fermilab (2007-06-25). Retrieved on 2007-06-25.
5. ^ http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0707.0589 "Observation and mass measurement of the baryon Xi(b)-"