Sensitivity of T2KK to non-standard interactions

Assuming only the non-zero electron and tau neutrino components εee, εeτ, εττ of the non-standard matter effect and postulating the atmospheric neutrino constraint εττ=|εeτ|2/(1+εee), the sensitivity to the non-standard interaction in neutrino propagation of the T2KK neutrino long-baseline experiment is estimated. It is found that T2KK can constrain the parameters |εee|≤1, |εeτ|≤0.2.