Abstract
We report results on semileptonic B → πl v decay form factors near q max 2 using NRQCD heavy quark and clover light quark actions and currents improved through O(α a). An inconsistency with the soft pion relation f 0 ( q max 2 = f B / f π found in a previous work is confirmed, and a possible solution with nonperturbative renormalization is discussed. We find that f +( q 2) is well described by the B ∗ pole near q max 2, and its 1/ M B scaling is also consistent with the prediction of the pole dominance model.
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