We show that hierarchically small vacuum expectation values of the superpotential in supersymmetric theories can be a consequence of an approximate R symmetry. We briefly discuss the role of such small constants in moduli stabilization and understanding the huge hierarchy between the Planck and electroweak scales.

Approximate flavor symmetries in the quark sector have been used as a handle on physics beyond the Standard Model. Due to the great interest in neutrino masses and mixings and the wealth of existing and proposed neutrino experiments it is important to extend this analysis to the leptonic sector. We show that in the see-saw mechanism, the neutrino masses and mixing angles do not depend on the de...

We study the approximate flavour symmetries imposed on the lepton sector assuming see-saw mechanism as the neutrino mass structure. We apply the symmetry to various neutrino phenomenologies and obtain constraints on neutrino masses and mixings. Typeset using REVTEX [email protected] 1

KN) name -(1940). We should like to express our gratitude to the CERN Track Chamber Division, and specially to Professor Ch. Peyrou, Dr. R. Armenteros, and Dr. D. E. Plane, for supplying the film and the beam. This work would not have been possible without the encouragement and advices of Dr. R. Barloutaud, and one of us (J.G. ) would like to thank Professor A, Berthelot and Dr. A. Leveque for ...

We show that several types of global strings occur in colour superconducting quark matter due to the spontaneous violation of relevant U(1) symmetries. These include the baryon U(1)B , and approximate axial U(1)A symmetries as well as an approximate U(1)S arising from kaon condensation. We discuss some general properties of these strings and their interactions. In particular, we demonstrate tha...