Skip to main content
Discrete Symmetries and Isosinglet Quarks in Low-Energy Supersymmetry
Physics Letters B
  • Diego Castano, Massachusetts Institute of Technology
  • Stephan P. Martin, Northeastern University
Publication Date
Peer Reviewed

Many extensions of the minimal supersymmetric standard model contain superfields for quarks which are singlets under weak isospin with electric charge -13. We explore the possibility that such isosinglet quarks have low or intermediate scale masses, but do not mediate rapid proton decay because of a discrete symmetry. By imposing the discrete gauge anomaly cancellation conditions, we show that the simplest way to achieve this is to extend the Z3 “baryon parity” of Ibáñez and Ross to the isosinglet quark superfields. This can be done in three distinct ways. This strategy is not consistent with grand unification with a simple gauge group, but may find a natural place in superstring-inspired models, for example. An interesting feature of this scenario is that proton decay is absolutely forbidden.


©1994 Published by Elsevier B.V.

Additional Comments

The work of D.J.C. was supported in part by the U.S. Department of Energy under cooperative agreement DE-FC02-94ER40818 and in part by the Texas National Research Laboratory Commission under grant RGFY93278C. The work of S.P.M. was supported in part by the National Science Foundation grants PHY-90-01439 and PHY-93-06906 and U.S. Department of Energy grant DE-FG02-85ER40233.

Citation Information
Diego Castano and Stephan P. Martin. "Discrete Symmetries and Isosinglet Quarks in Low-Energy Supersymmetry" Physics Letters B Vol. 340 Iss. 1-2 (1994) p. 67 - 73 ISSN: 0370-2693
Available at: