Extracting V_{ub} Without Recourse to Structure Functions

Details Extracting V_{ub} Without Recourse to Structure Functions Extracting V_{ub} Without Recourse to Structure Functions

1999-09-16

arxiv.org/abs/hep-ph/9909404v2

Phys.Rev. D61 (2000) 053006

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, no figures, minor typos corrected

Scientific paper

10.1103/PhysRevD.61.053006

We present a closed form expression for |V_{ub}|^2/ |V_{tb} V_{ts}^*|^2 in terms of the endpoint photon and lepton spectra from the inclusive decays B -> X_s\gamma and B -> X_u\ell\nu, respectively, which includes the resummation of the endpoint logs at next to leading order and is completely independent of the B meson structure function. The use of this expression for extracting V_{ub} would eliminate the large systematic errors usually incurred due to the modeling of the heavy quarks' Fermi motion.

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