Observation of B_s to phi gamma and Search for B_s to gamma gamma Decays at Belle

Abstract

We search for the radiative penguin decays B_s to phi gamma and B_s to gamma gamma in a 23.6 fb-1 data sample collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. We observe for the first time a radiative penguin decay of the B_s meson in the B_s to phi gamma mode. No significant B_s to gamma gamma signal is observed.

5 pages, 3 figures, accepted by Physics Review Letters

References in corpus (2)

• Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
• B->V gamma Beyond QCD Factorisation

Cited by in corpus (4)

• Measurement of the ratio of branching fractions BR(B0 -> K*0 gamma)/BR(Bs0 -> phi gamma) and the direct CP asymmetry in B0 -> K*0 gamma
• Search for $B_s^0\to \gamma \gamma$ and a measurement of the branching fraction for $B_s^0\to \varphi \gamma$
• A Search for the Decay B^0 -> gamma gamma
• Observation of Bs->Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference ΔΓ_s