Neutrino Oscillations and Collider Test of the R-parity Violating Minimal Supergravity Model

We study the R-parity violating minimal supergravity models accounting for the observed neutrino masses and mixing, which can be tested in future collider experiments. The bi-large mixing can be explained by allowing five dominant tri-linear couplings lambda'_1,2,3 and lambda_1,2. The desired ratio of the atmospheric and solar neutrino mass-squared differences can be obtained in a very limited parameter space where the tree-level contribution is tuned to be suppressed. In this allowed region, we quantify the correlation between the three neutrino mixing angles and the tri-linear R-parity violating couplings. Qualitatively, the relations |lambda'₁|<|lambda'₂| ~ |lambda'₃|, and |lambda₁| ~ |lambda₂| are required by the large atmospheric neutrino mixing angle theta₂₃ and the small angle theta₁₃, and the large solar neutrino mixing angle theta₁₂, respectively. Such a prediction on the couplings can be tested in the next linear colliders by observing the branching ratios of the lightest supersymmetric particle (LSP). For the stau or the neutralino LSP, the ratio |lambda₁|²:|lambda₂|²:|lambda₁|²+|lambda₂|² can be measured by establishing Br(enu):Br(munu):Br(taunu) or Br(nue^+/-tau^mp):Br(numu^+/-tau^mp):Br(nutau^+/-tau^mp), respectively. The information on the couplings lambda'_i can be drawn by measuring Br(l_itbar b)propto|lambda'_i|² if the neutralino LSP is heavier than the top quark.