CDF collaboration finds new baryons that contain b quarks

Cern Courier : Researchers at the Tevatron at Fermilab have found two new heavy particles and two of their excited states. The CDF collaboration has observed the first Σb particles, made up of quark combinations uub and ddb. Until now the Îb0 (udb) was the only baryon (three quark) state containing a b quark to have been observed.