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The supersymmetric sector of minimal supersymmetric standard model (MSSM)possesses a U(1) R-symmetry which contains Z_2 matter parity. Non-zero neutrinomasses, consistent with a 'redefined' R-symmetry, are possible through thesee-saw mechanism and/or a pair of superheavy (mass M) SU(2)_L triplets withvev of order M^2_W/M. If this R-symmetry is respected by the higher orderterms, then baryon number conservation follows as an immediate consequence. Inthe presence of right handed neutrinos, the observed baryon asymmetry of theuniverse arises via leptogenesis. An interplay of R- and Peccei-Quinn symmetrysimultaneously resolves the strong CP and mu problems.Comment: 12 pages (including one postscript figure), Revtex, minor corrections  mad

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>symmetry in the minimal supersymmetric standard model and beyond with several consequences

Rsymmetry in the minimal supersymmetric standard model and beyond with several consequences