Impact of the first SNO results on neutrino mass and mixing

Abstract

We investigate the implications of the SNO Charged-current (CC) and Electron Scattering (ES) measurements of solar ⁸B neutrino fluxes for neutrino mass and mixing parameters by performing a global and unified χ² analysis of the solar neutrino data in the framework of two neutrino mixing. We consider both νe–ν_active and νe–ν_sterile solutions and perform (i) analysis of the total rates data of Cl, Ga, SK and SNO experiments and (ii) global analysis including the total rates data, the recoil electron spectrum data of SK and the CC spectrum observed at SNO. For the νe–ν_active case the inclusion of the SNO results in the analysis of the total rates reduces (enhances) the Goodness-of-fit (GOF) of the SMA (LMA) solution. The flat spectrum observed at SK further favours the LMA solution over the SMA solution and no allowed area is obtained in the SMA region at 3σ level from the global analysis. For the νe–ν_sterile case, with the inclusion of the SNO results, all the solutions are disfavoured with a probability of more than 99% from the total rates analysis while for the global analysis the GOF of these become much worse.