The radiative decay $D^0\to {\bar{K}}^{\ast 0}\gamma$ with vector meson dominance

Abstract

Motivated by the experimental measurements of $D^0$ radiative decay modes we have proposed a model to study the $D^0\to {\bar{K}}^{\ast 0}\gamma$ decay, by establishing a link with $D^0\to {\bar{K}}^{\ast 0}V$ $(V={\rho }^0,\omega )$ decays through the vector meson dominance hypothesis. In order to do this properly, we have used the Lagrangians from the local hidden gauge symmetry approach to account for $V\gamma$ conversion. As a result, we have found the branching ratio $\mathcal{B}[D^0\to {\bar{K}}^{\ast 0}\gamma ]=(1.55-3.44)\times 10^{-4}$, which is in fair agreement with the experimental values reported by Belle and Babar collaborations.

Comments: 14 pages and 3 figures