A team at the University of Zurich says that the baryon, known as Xi_b^*, is a composite subatomic particle made up of three quarks.
All baryons that are composed of the three lightest quarks ("up", "down", and "strange" quarks) are known. Only very few baryons with heavy quarks have been observed to date. They can be generated artificially in particle accelerators as they are heavy and very unstable.
In the course of proton collisions in the LHC at CERN, physicists Claude Amsler, Vincenzo Chiochia and Ernest Aguil