Search for the Exclusive Radiative Decays B -> rho gamma and B -> omega gamma

TL;DR

This study searched for rare radiative decays of B mesons into rho and omega particles, setting upper limits on their branching ratios due to no significant signals observed in a large data sample.

Contribution

First to set experimental upper limits on B->rho gamma and B->omega gamma decays using BABAR data, constraining theoretical models of these rare processes.

Findings

No significant signals detected in the decay channels.

Upper limits on branching ratios were established at 90% confidence level.

The limits constrain the ratio BR[B->rho gamma]/BR[B->K* gamma] to less than 0.047.

Abstract

A search for the exclusive radiative decays B->rho(770) gamma and B^0->omega(782) gamma is performed on a sample of 84 million BB-bar events collected by the BABAR detector at the PEP-II asymmetric e^+e^- collider. No significant signal is seen in any of the channels. We set preliminary upper limits of BR[B^0->rho^0 gamma]< 1.4 times 10^{-6}, BR[B^+ -> rho^+ gamma] < 2.3 times 10^{-6} and BR[B^0 -> omega gamma]< 1.2 times 10^{-6} at 90% Confidence Level. Combining these into a single limit on the generic process B-> rho gamma, we find the preliminary limit BR[B -> rho gamma]<1.9 times 10^{-6}, corresponding to a limit of BR[B -> rho gamma]/BR[B-> K* gamma] < 0.047 at 90% Confidence Level.