ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 610, p. 23-30
Observation of B+→K+ηγ
We report measurements of radiative B decays with Kηγ final states, using a data sample of 253 fb-1 recorded at the Υ(4S) resonance with the Belle detector at the KEKB e+e- storage ring. We observe B+→K+ηγ for the first time with a branching fraction of (8.4±1.5(stat)-0.9 +1.2(syst))×10-6 for MKη<2.4 GeV/c2, and find evidence of B0→K 0ηγ. We also search for B→K3*(1780) γ. © 2005 Elsevier B.V. All rights reserved.