Chemistry and Physics Faculty Articles

Document Type

Article

Publication Date

12-1994

Publication Title

Physics Letters B

ISSN

0370-2693

Volume

340

Issue/No.

1-2

First Page

67

Last Page

73

Peer Reviewed

1

Abstract

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.

Comments

©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.

DOI

10.1016/0370-2693(94)91299-8

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