A MEASUREMENT OF THE INCLUSIVE B ---> S GAMMA BRANCHING RATIO.
1998
The flavour changing
neutral currentdecay b --> s gamma has been detected in hadronic Z decays collected by
ALEPHat LEP. The signal is isolated in lifetime-tagged b (b) over bar events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons. The
background processesare normalised from the data themselves. The inclusive branching ratio is measured to be(3.11 +/- 0.80(stat) +/- 0.72(syst)) x 10(-4),consistent with the Standard Model expectation via penguin processes. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
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