Extracting V_ub without recourse to structure functions

We present a closed form expression for |V_ub|²/|V_tbV_ts*|² in terms of the end point photon and lepton spectra from the inclusive decays B→X_sγ and B→X_uℓν, respectively, which includes the resummation of the end point logarithms 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.