Minimal supergravity with R-parity breaking

We show that the minimal R-parity breaking model characterized by an effective bilinear violation of R-parity in the superpotential is consistent with minimal N=1 supergravity unification with radiative breaking of the electroweak symmetry and universal scalar and gaugino masses. This one-parameter extension of the MSSM-SUGRA model provides therefore the simplest reference model for the breaking of R-parity and constitutes a consistent truncation of the complete dynamical models with spontaneous R-parity breaking proposed previously. We comment on the lowest-lying CP-even Higgs boson mass and discuss its minimal N=1 supergravity limit, determine the ranges of

\tan\beta

and bottom quark Yukawa couplings allowed in the model, as well as the relation between the tau neutrino mass and the bilinear R-parity violating parameter.

Note:

22 pages including 4 figures, Latex. A numerical error is corrected which changes figure number 4. The rest of the paper stays the same Report-no: FTUV/97-32, IFIC/97-31, FISIST/8-97/CFIF

R parity: violation
supergravity: minimal
electroweak interaction
symmetry breaking
mass: gaugino
Higgs particle: mass
coupling: bottom
coupling: Yukawa
grand unified theory
neutrino/tau: mass

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