Search for the Decays B0->e+e-gamma and B0->mu+mu-gamma

Abstract

We present results of a search for the decays $B^0\to {\ell }^{+}{\ell }^{-}\gamma$ ($\ell =e$, $\mu$). The search is performed using $320\times 10^6$ $B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ resonance with the BABAR detector at the PEP-II $B$ Factory at SLAC. We find no significant signal and set the following branching fraction upper limits at the 90% confidence level: $\mathcal{B}(B^0\to e^{+}{e}^{-}\gamma )<1.2\times 10^{-7}$ and $\mathcal{B}(B^0\to {\mu }^{+}{\mu }^{-}\gamma )<1.5\times 10^{-7}$.

7 pages, 6 figures, submitted to Phys. Rev. Lett