Constraints on the Nonstandard Interaction in Propagation from Atmospheric Neutrinos

Figure 1

The allowed region in the (, ) plane from the SK atmospheric neutrino data for a normal mass hierarchy (a) and for an inverted mass hierarchy (b). In the left panel, the best-fit point is (, ) = (−1.0, 0.0), although it is difficult to see from the figure that there is a very narrow region with CL less than 0.5 near this point.

(a) SK 4438 days NH

(b) SK 4438 days IH