Global oscillation analysis of solar neutrino data with helioseismically constrained fluxes

Abstract

A seismic model for the Sun calculated using the accurate helioseismic data predicts a lower 8B neutrino flux as compared to the standard solar model (SSM). However, there persists a discrepancy between the predicted and measured neutrino fluxes and it seems necessary to invoke neutrino oscillations to explain the measurements. In this work, we have performed a global, unified oscillation analysis of the latest solar neutrino data (including the results of SNO charged current rate) using the seismic model fluxes as theoretical predictions. We determine the best-fit values of the neutrino oscillation parameters and the χ_min² for both ν_e-ν_active and ν_e-ν_sterile cases and present the allowed parameter regions in the Δm²-tan²θ plane for ν_e-ν_active transition. The results are compared with those obtained using the latest SSM by Bahcall and co-workers.