Journal article

A measurement of the inclusive b → sγ branching ratio

R Barate, D Buskulic, D Decamp, P Ghez, C Goy, JP Lees, A Lucotte, E Merle, MN Minard, JY Nief, B Pietrzyk, R Alemany, G Boix, MP Casado, M Chmeissani, JM Crespo, M Delfino, E Fernandez, M Fernandez-Bosman, L Garrido Show all

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Published : 1998


The flavour changing neutral current decay b → sγ has been detected in hadronic Z decays collected by ALEPH at LEP. The signal is isolated in lifetime-tagged bb̄ events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The background processes are normalised from the data themselves. The inclusive branching ratio is measured to be (3.11±0.80stat±0.72syst)× 10-4, consistent with the Standard Model expectation via penguin processes. © 1998 Published by Elsevier Science B.V. All rights reserved.

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