Observation of the Xi_b^0 Baryon
  The first observation of the heavy baryonic state \Xi_b^0 is reported by the CDF Collaboration. A new decay mode of the established state \Xi_b^- is also observed. In both cases the decay into a \Xi_c plus a charged pion is seen, with an equivalent statistical significance of above 6.8 sigma. 
Peter Bussey (for the CDF Collaboration)
hep-ex