Testing the chirality of b to u current with B0→ρ−ℓ+ν

We study the effects of a modest V+A admixture strength in b→u current in the decay B→ρlν. We have shown that the decay rate, lepton forward-backward distribution asymmetry AFB and polarization ratio are sensitive to the admixture. Future experimental studies of the decay at BaBar and Belle could clarify the chirality of b→u current and might reveal hints for new physics with right-handed quark currents.