Subleading shape functions in B -> X_u l νand the determination of |Vub|

Details Subleading shape functions in B -> X_u l νand the determination of |Vub| Subleading shape functions in B -> X_u l νand the determination of |Vub|

2002-05-15

arxiv.org/abs/hep-ph/0205150v1

Phys.Lett.B543:261-268,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures

Scientific paper

10.1016/S0370-2693(02)02444-9

We calculate the subleading twist contributions to the endpoint of the inclusive lepton energy spectrum in B -> X_u l \nu. We show that the same two subleading twist functions that appear in the decay B -> X_s \gamma govern the subleading effects in this decay. Using these results we find large O(Lambda/mB) corrections to the determination of |Vub| from the endpoint of the charged lepton spectrum. Using a simple model for the relevant subleading shape functions, we estimate the uncertainty in |Vub| from Lambda/mb corrections to be at the ~ 15% level for a lower lepton energy cut of 2.2 GeV.

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