Search for the decay $D^0\to {\pi }^0\nu \bar{\nu }$

Abstract

We present the first experimental search for the rare charm decay $D^0\to {\pi }^0\nu \bar{\nu }$. It is based on an $e^{+}{e}^{-}$ collision sample consisting of $10.6\times 10^6$ pairs of $D^0{\bar{D}}^0$ mesons collected by the BESIII detector at $\sqrt{s}$=3.773 GeV, corresponding to an integrated luminosity of 2.93~fb${}^{-1}$. A data-driven method is used to ensure the reliability of the background modeling. No significant $D^0\to {\pi }^0\nu \bar{\nu }$ signal is observed in data and an upper limit of the branching fraction is set to be $2.1\times 10^{-4}$ at the 90$\%$ confidence level. This is the first experimental constraint on charmed-hadron decays into dineutrino final states.

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