Preprint / Particle Physics - Phenomenology CERN-TH-2002-069 RM3-TH-02-4 hep-ph/0204140

A new model-independent way of extracting |V_ub/V_cb|

Aglietti, U (CERN) ; Ciuchini, M ; Gambino, P

CERN
12 Apr 2002
CERN Geneva

Abstract: The ratio between the photon spectrum in B -> X_s gamma and the differential semileptonic rate wrt the hadronic variable M_X/E_X is a short-distance quantity calculable in perturbation theory and independent of the Fermi motion ofthe b quark in the B meson. We present a NLO analysis of this ratio and show how it can be used to determine |V_ub/V_cb| independently of any model for the shape function. We also discuss how this relation can be used to test thevalidity of the shape-function theory on the data.

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CERN Divisions > Theoretical Physics (TH)
Articles & Preprints > Preprints



 Record created 2016-12-12, last modified 2016-12-12


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