A new model-independent way of extracting |Vub/Vcb|

2002/04/12 by U. Aglietti, Ugo Aglietti, M. Ciuchini +2 · 3 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/s0550-3213(02)00464-9

published as Nucl.Phys.B637:427-444,2002 · 20 pages, 3 figs

arxiv created 2002/04/12 · openalex publication_date 2002/08/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 of the 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 the validity of the shape-function theory on the data.

Citations

• Comment on nonperturbative effects in
• A sum rule from the shape function
• Review of Particle Physics

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