Subleading Shape Functions and the Determination of |V_{ub}|

Details Subleading Shape Functions and the Determination of |V_{ub}| Subleading Shape Functions and the Determination of |V_{ub}|

2002-06-28

arxiv.org/abs/hep-ph/0207002v2

Phys.Lett. B543 (2002) 269-275

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 1 figure. Final version to appear in Physics Letters B. By a smarter choice of weight function, m_b and lambda_1 have

Scientific paper

10.1016/S0370-2693(02)02462-0

It is argued that the dominant subleading shape-function contributions to the endpoint region of the charged-lepton energy spectrum in B -> X_u l nu decays can be related in a model-independent way to an integral over the B -> X_s gamma photon spectrum. The square root of the fraction of B -> X_u l nu events with charged-lepton energy above E_0=2.2 GeV can be calculated with a residual theoretical uncertainty from subleading shape-function effects that it safely below the 10% level. These effects have therefore a minor impact on the determination of |V_{ub}|.

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