Global analysis of solar neutrino and KamLAND data

A global analysis of the data from all the solar neutrino experiments combined with the recent KamLAND data is presented. A formula frequently used in the literature gives survival probability for three active solar neutrino flavours in terms of a suitably modified two-flavour survival probability. Corrections to this formula, which depend on theta(13) and deltam(31)(2), are calculated. For the mass scale suggested by the atmospheric neutrino experiments the contributions of 6 2 deltam(31)(2) to these corrections are found to be negligible. The role of 013 in solar neutrino physics is elaborated. For electron neutrino oscillations into another active flavour, we find best fit values of tan(2) theta(12) similar to 0.46, tan(2) theta(13) similar to 0 and deltam(21)(2) similar to 7.1 x 10(-5) eV(2). It is found that the combined solar neutrino and KamLAND data provide the limit cos(4) theta(13) > 0.8 at the 90% confidence level.