Xi baryon

The Xi baryons or cascade particles are a family of subatomic hadron particles which have the symbol Ξ and have a +2, +1 or -1 elementary charge or are neutral. They are baryons containing three quarks: 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 a charged Xi baryon was in cosmic ray experiments by the Manchester group in 1952. The first discovery of the neutral Xi particle was at Lawrence Berkeley Laboratory in 1959. It was also observed as a daughter product from the decay of the omega baryon (Ω−) observed at Brookhaven National Laboratory in 1964.

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