Axino as a sterile neutrino and R parity violation
Abstract
We point out that axino can be a natural candidate for sterile neutrino which would accommodate the LSND data with atmospheric and solar neutrino oscillations. It is shown that the so called 3+1 scheme can be easily realized when supersymmetry breaking is mediated by gauge interactions and also R-parity is properly broken. Among the currently possible solutions to the solar neutrino problem, only the large angle MSW oscillation is allowed in this scheme. The weak scale value of the Higgs μ parameter and the required size of R-parity violation can be understood by means of spontaneously broken Peccei-Quinn symmetry.
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