Baryon Number Violation Involving Higher Generations
  Proton stability seems to constrain rather strongly any baryon number violating process. We investigate the possibility of baryon number violating processes involving right-handed dynamics or higher generation quarks. Our results strongly suggest that there will be no possibility to observe baryon number violation in tau or higher generation quark decays, at any future machine. 
Wei-Shu Hou, Makiko Nagashima and Andrea Soddu