Fitting direct interaction pieces into neutrino puzzles

Abstract

We develop a framework and unified, compact notation to include neutrino direct interaction effects with neutrino oscillations for a wide class of low-energy, effective four-Fermi interactions. Modest flavor-violating interaction strengths can make significant changes in the boundaries in $\Delta M^2\leftrightarrow si{n}^{2}2\theta$ and in $ta{n}^2{\theta }_{13}\leftrightarrow ta{n}^2{\theta }_{23}parameterspace.WedrawexamplesfromtheL-Rsymmetricand$MSSM + \slash R$modelsandfindtherecentlyreporteddecay-at-rest$\mu \leftrightarrow e$ transition probability can be described without oscillations in L-R symmetric models.

Comments: 11 pages, LaTeX, 3 figures