Andrija Rasin

SO(10) theory of R-parity and neutrino mass

Abstract We study the Higgs sector of a SO(10) grand unified theory which predicts exact conservation of R-parity at all scales and incorporates the see-saw mechanism. We find possible intermediate scales and light states compatible with the constraints coming from the running of the gauge couplings. Such a pattern could lower the SO(10) breaking scale, allowing the d=6 proton decay operators to be comparable in magnitude to the d=5 ones.

See-saw and supersymmetry or exact R-parity

Abstract We show how the renormalizable see-saw mechanism in the context of supersymmetry and spontaneously broken B−L symmetry implies exact R-parity at all energies. We argue that supersymmetry plays an important role in providing a “canonical” form for the see-saw, in particular in grand unified theories that solve the doublet-triplet splitting problem via the Dimopoulos–Wilczek mechanism.

Supersymmetry and large scale left-right symmetry

We show that the low energy limit of the minimal supersymmetric Left-Right models is the supersymmetric standard model with an exact R-parity. The theory predicts a number of light Higgs scalars and fermions with masses much below the

Simple supersymmetric solution to the strong CP problem.

B-L

Nonabelian discrete symmetries, fermion mass textures and large neutrino mixing

and

Supersymmetric solution to CP problems.

SU(2)_R

P, C and strong CP in left-right supersymmetric models

breaking scales. The non-renormalizable version of the theory has a striking prediction of light doubly charged supermultiplets which may be accessible to experiment. Whereas in the renormalizable case the scale of parity breaking is undetermined, in the non-renormalizable one it must be bigger than about

Intermediate scales in supersymmetric GUTs: the survival of the fittest

10^{10} - 10^{12}

{ital C}, {ital P}, and Strong {ital CP} in Left-Right Supersymmetric Models

GeV. The precise nature of the see-saw mechanism differs in the two versions, and has important implications for neutrino masses.

Seeking gauge bileptons in linear colliders

It is shown that the minimal supersymmetric left-right model can provide a natural solution to the strong {ital CP} problem without the need for an axion, nor any additional symmetries beyond supersymmetry and parity. {copyright} {ital 1996 The American Physical Society.}