Comparing B -> X_u l nu_l to B -> X_s gamma

Details Comparing B -> X_u l nu_l to B -> X_s gamma Comparing B -> X_u l nu_l to B -> X_s gamma

1999-04-28

arxiv.org/abs/hep-ph/9904475v2

Phys.Rev.D60:114040,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 4 figures. One Paragraph added, Version published in Phys.Rev. D60

Scientific paper

10.1103/PhysRevD.60.114040

We suggest a method to determine V_ub / V_ts through a comparison of B -> X_u l nu_l and B -> X_s gamma. The relevant quantity is the spectrum of the light-cone component of the final state hadronic momentum, which in B -> X_s gamma is the photon energy while in B -> X_u l nu_l this requires a measurement of both hadronic energy and hadronic invariant mass. The non-perturbative contributions at tree level to these distributions are identical and may be cancelled by taking the ratio of the spectra. Radiative corrections to this comparison are discussed to order alpha_s and are combined with the non-perturbative contributions.

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