Does proton stability imply the existence of an extra Z0?

A. Font, L. E. Ibáñez, F. Quevedo

Research output: Contribution to journalArticlepeer-review


It is well known that the minimal supersymmetric standard model admits in general Yukawa couplings violating baryon and lepton number. We argue that a generic four-dimensional SU (3) × SU (2) × U (1) string does have in general this type of dangerous couplings. We propose as the most natural solution to the proton stability problem the existence of extra low-energy gauge symmetries (U(1)'s) forbidding these terms. We construct in a systematic way the minimal extensions of the supersymmetric standard model in which gauge symmetries forbid all baryon- and/or lepton-number-violating couplings but allow Yukawa couplings for quarks and charged leptons. These models contain an extra U(1) which is not of the E6-type.

Original languageEnglish (US)
Pages (from-to)79-88
Number of pages10
JournalPhysics Letters B
Issue number1
StatePublished - Sep 7 1989

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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