Solar neutrino interactions: Using charged currents at SNO to tell neutral currents at Super-Kamiokande

In the presence of flavor oscillations, muon and tan neutrinos can contribute to the Super-Kamiokande (SK) solar neutrino signal through the neutral current process upsilon(mu,tau)e(-) --> upsilon(mu,tau)e(-). We show how to separate the upsilon(e) and upsilon(u,tau) event rates in SK in a model independent way, by using the rate of the charged current process upsilon(e)d --> ppe(-) from the Sudbury Neutrino Observatory (SNO) experiment, with an appropriate choice of the SK and SNO energy thresholds. Under the additional hypothesis of no oscillations into sterile states, we also show how to determine the absolute B-8 neutrino flux from the same data set, independently of the upsilon(e) survival probability.