Radiative Penguin Decays at BABAR

Abstract

We report preliminary results based on a data sample of 20.7 fb^(-1) recorded at the Υ(4S) resonance by the BABAR detector at the PEP-II energy asymmetric collider at the Stanford Linear Accelerator Center. We have measured the branching fraction B(B^0→K^(*0)γ)=(4.39±0.41±0.27)×10^(–5) and measured a charge asymmetry in the B→K^*γ decays consistent with zero: A_(CP)=–0.035±0.076±0.012. We also searched for the decay B^0 →γγ and placed the 90% C.L. limit B(B^0 →γγ)<1.7×10^(-6). The search for the electroweak penguin decays B→K^(*)l^(+)l^(-) yielded the limits B(B→Kl^(+)l^(-))<0.6×10^(-6) and B(B→K*l^(+)l^(-))<2.5×10^(-6) at the 90% C.L.

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