Analyticity, Shapes of Semileptonic Form Factors, and B to pi l nu

Details Analyticity, Shapes of Semileptonic Form Factors, and B to pi l nu Analyticity, Shapes of Semileptonic Form Factors, and B to pi l nu

1997-02-11

arxiv.org/abs/hep-ph/9702300v1

Phys.Rev. D56 (1997) 303-311

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, Latex, three eps figures included

Scientific paper

10.1103/PhysRevD.56.303

We give a pedagogical discussion of the physics underlying dispersion relation-derived parameterizations of form factors describing B -> pi l nu and B -> D l nu. Moments of the dispersion relations are shown to provide substantially tighter constraints on the f_+ (t) form factor describing B -> pi l nu than the unweighted dispersion relation alone. Heavy quark spin symmetry relations between the B -> pi l nu and B^* -> pi l nu form factors enables such constraints to be tightened even further.

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