The flavour changing neutral current decay b --> s gamma has been detected in hadronic Z decays collected by ALEPH at 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 processes are 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.
|Autori interni:||MAGGI, Giorgio Pietro|
CREANZA, Donato Maria
|Titolo:||A measurement of the inclusive b -> s gamma branching ratio|
|Rivista:||PHYSICS LETTERS. SECTION B|
|Data di pubblicazione:||1998|
|Digital Object Identifier (DOI):||10.1016/S0370-2693(98)00404-3|
|Appare nelle tipologie:||1.1 Articolo in rivista|