Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-20
Phys.Rev.D58:071702,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages (including one postscript figure), Revtex, minor corrections made
Scientific paper
10.1103/PhysRevD.58.071702
The supersymmetric sector of minimal supersymmetric standard model (MSSM) possesses a U(1) R-symmetry which contains Z_2 matter parity. Non-zero neutrino masses, consistent with a 'redefined' R-symmetry, are possible through the see-saw mechanism and/or a pair of superheavy (mass M) SU(2)_L triplets with vev of order M^2_W/M. If this R-symmetry is respected by the higher order terms, then baryon number conservation follows as an immediate consequence. In the presence of right handed neutrinos, the observed baryon asymmetry of the universe arises via leptogenesis. An interplay of R- and Peccei-Quinn symmetry simultaneously resolves the strong CP and mu problems.
Lazarides George
Shafi Qaisar
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