A reanalysis of the LSND neutrino oscillation experiment

We reanalyse the LSND neutrino oscillation results in the framework of the projected quasiparticle random phase approximation (PQRPA), which is the only RPA model that treats the Pauli principle correctly, and accounts satisfactorily for great majority of the weak decay observables around C12. We have found that the employment of the PQRPA inclusive DIF C12(νe,e−)N12 cross-section, instead of the CRPA used by the LSND Collaboration in the νμ→νe oscillations study of the 1993-1995 data sample, leads to the following: (1) the oscillation probability is increased from (0.26±0.10±0.05)% to (0.33±0.10±0.13)%, and (2) the previously found consistence between the (sin22θ,Δm2) confidence level regions for the νμ→νe and the ν¯μ→ν¯e oscillations is significantly diminished. These effects are not due to the difference in the uncertainty ranges for the neutrino-nucleus cross-section, but to the difference in the cross-sections themselves.