|Vub| from UTangles and B→πlν

The angles of the CKM unitarity triangle are now known well enough to allow a determination of its sides from global fits, with good accuracy. Assuming that new physics does not affect the angles, UTfit and CKMfitter find vertical bar V-ub vertical bar = (3.50 +/- 0.18) x 10(-3). Using this result, and new high-precision data on the spectrum of B -> pi l nu decays from BaBar, we find vertical bar V-ub vertical bar f(+)(0) = (9.1 +/- 0.7) x 10(-4) and f(+) (0) = 0.26 +/- 0.02, with f(+) the B -> pi weak transition form factor. These results are completely model-independent. We compare them to theoretical calculations from lattice and QCD sum rules on the light-cone. (c) 2006 Elsevier B.V. All rights reserved.