Extracting V_{ub} Without Recourse to Structure Functions

Abstract

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_sγand B -> X_u\ellν, 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.

20 pages, no figures, minor typos corrected

References in corpus (2)

• B -> X_u l nu decay distributions to order alpha_s
• Comparing B -> X_u l nu_l to B -> X_s gamma

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