Tensions between the appearance data of T2K and NOvA

Abstract

The long baseline neutrino experiments, T2K and NOvA, have taken significant amount of data in each of the four channels: (a) ${\nu }_{\mu }$ disappearance, (b) ${\bar{\nu }}_{\mu }$ disappearance (c) ${\nu }_e$ appearance and (d) ${\bar{\nu }}_e$ appearance. There is a mild tension between the disappearance and the appearance data sets of T2K. A more serious tension exists between the ${\nu }_e$ appearance data of T2K and the ${\nu }_e/{\bar{\nu }}_e$ appearance data of NOvA. This tension is significant enough that T2K rules out the best-fit point of NOvA at $95\%$ confidence level whereas NOvA rules out T2K best-fit point at $90\%$ confidence level. We explain the reason why these tensions arise. We also do a combined fit of T2K and NOvA data and comment on the results of this fit.

Comments: matches the published version