Measurement of the Branching Fractions of the Radiative Charm Decays $D^{0} \to {\bar K}^{*0} \gamma$ and $D^{0} \to \phi \gamma$

TL;DR

This paper reports the first measurement of the branching fraction for the radiative decay $D^{0} o {ar K}^{*0} \gamma$ and also measures the decay $D^{0} o \phi \gamma$ relative to a known decay, using data from the BaBar detector.

Contribution

It provides the first measurement of the branching fraction for $D^{0} o {ar K}^{*0} \gamma$ and improves understanding of charm radiative decays.

Findings

Measured ${ m BR}(D^{0} o {ar K}^{*0} \\gamma)/{ m BR}(D^{0} o K^{-} \\pi^{+})$ as $(8.43 \\pm 0.51 \\pm 0.70) imes 10^{-3}$

Measured ${ m BR}(D^{0} o \\phi \\gamma)/{ m BR}(D^{0} o K^{-} \\pi^{+})$ as $(7.15 \\pm 0.78 \\pm 0.69) imes 10^{-4}$

First measurement of ${ m BR}(D^{0} o {ar K}^{*0} \\gamma)$.

Abstract

We present a measurement of the branching fractions for the Cabibbo-favored radiative decay, $D^{0} \to {\bar K}^{*0} \gamma$, and the Cabibbo-suppressed radiative decay, $D^{0} \to \phi \gamma$. These measurements are based on a data sample corresponding to an integrated luminosity of $387.1 fb^{-1}$, recorded with the BaBar detector at the PEP-II $e^+e^-$ asymmetric-energy collider operating at center-of-mass energies 10.58 and 10.54 GeV. We measure the branching fractions relative to the well-studied decay $D^{0} \to K^{-} \pi^{+}$ and find ${\cal B}(D^{0} \to {\bar K}^{*0} \gamma)/{\cal B}(D^{0} \to K^{-} \pi^{+}) = (8.43 \pm 0.51 \pm 0.70) \times 10^{-3}$ and ${\cal B}(D^{0} \to \phi \gamma)/{\cal B}(D^{0} \to K^{-} \pi^{+}) = (7.15 \pm 0.78 \pm 0.69) \times 10^{-4}$, where the first error is statistical and the second is systematic. This is the first measurement of ${\cal B}(D^{0} \to {\bar K}^{*0} \gamma)$.