$D^0\mbox{-}\overline{D}^0$ Mixing Results from BABAR with D0 → K+π-π0

Abstract

We present a preliminary search for [Formula: see text] mixing using the decays D0 → K+π-π0, additionally presenting Dalitz-plot distributions and a measurement of the branching ratio for this mode. A new tagging technique is used to produce the doubly Cabibbo-suppressed Dalitz plot, which in turn is used to motivate the method used for the D-mixing search. We analyze 230.4 fb-1 of data collected from the BABAR detector at the PEP-II collider. Assuming CP conservation, we find RM < 0.054% with 95% confidence, and we estimate that the data are consistent with no mixing at a 4.5% confidence level. We present D-mixing results both with and without the assumption of CP conservation.