Abstract
Using the published KTeV samples of and decays, we perform a reanalysis of the scalar and vector form factors based on the dispersive parametrization. We obtain phase-space integrals and . For the scalar form factor parametrization, the only free parameter is the normalized form factor value at the Callan-Treiman point (); our best-fit results in . We also study the sensitivity of to different parametrizations of the vector form factor. The results for the phase-space integrals and are then used to make tests of the standard model. Finally, we compare our results with lattice QCD calculations of and .
- Received 2 June 2009
DOI:https://doi.org/10.1103/PhysRevD.81.052001
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