We report the results of a study of the exclusive charmless semileptonic B0->pilnu decay undertaken with approximately 227 million BBbar pairs collected at the Upsilon(4S) resonance with the BABAR detector. The analysis uses events in which the signal B mesons are reconstructed with a novel loose neutrino reconstruction technique. We obtain partial branching fractions in 12 bins of q2, the l+nu invariant mass squared, from which we extract the f+(q2) form factor shape and the total branching fraction: BF(B0->pilnu) = (1.44 +- 0.08(stat) +- 0.10(syst))x 10-4. Based on a recent theoretical calculation of the form factor, we find the magnitude of the CKM matrix element |Vub| to be (4.1 +- 0.2(stat) +- 0.2(syst) +0.6-0.4(FF))x 10-3, where the last uncertainty is due to the normalization of the form factor.

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Measurement of the $B^0 \to \pi^-\ell^+\nu$ Form Factor Shape and Branching Fraction, and Determination of $|V_{ub}|$ with a Loose Neutrino Reconstruction Technique

The flavor mixing in the quark sector is described in the Standard Model [1] through the Cabibbo-Kobayashi-Maskawa (CKM) matrix [2]. Following Wolfenstein’s notation [3], the CKM matrix can be expressed in terms of the four real parameters λ, A, ρ and η.

Marco Bomben

Papers

Unitarity Angles and Sides Measurement at BaBar