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Abstract: We present the results of a search for the radiative decay B -> K eta-gamma and find evidence for B^+ -> K^+ eta- gamma decays at the 3.3 standarddeviation level with a partial branching fraction of 3.6 +- 1.2 +- 0.4 x10e-6, where the first error is statistical and the second systematic. Thismeasurement is restricted to the region of combined K eta- invariant massless than 3.4GeVc^2. A 90% confidence level upper limit of 6.4 x 10e-6 isobtained for the decay B^0 -> K^0 eta- gamma in the same K eta- invariantmass region. These results are obtained from a 605 fb^-1 data sample containing657 x 10e6 B anti-B pairs collected at the Upsilon4S resonance with the Belledetector at the KEKB asymmetric-energy e^+e^- collider.



Autor: Belle Collaboration: R. Wedd, et al

Fuente: https://arxiv.org/



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