Constraints on axial two-body currents from solar neutrino data -: art. no. 055801

We briefly review recent calculations of neutrino-deuteron cross sections within the effective field theory and traditional potential model approaches. We summarize recent efforts to determine the counter term describing axial two-body currents, L-1A, in the effective field theory approach. We determine the counterterm directly from the solar neutrino data and find several, slightly different, ranges of L-1A under different sets of assumptions. Our most conservative fit value with the largest uncertainty is L-1A=4.5(-12)(+18) fm(3). We show that the contribution of the uncertainty of L-1A to the analysis and interpretation of the solar neutrino data measured at the Sudbury Neutrino Observatory is significantly less than the uncertainty coming from the lack of having a better knowledge of theta(13).