Dispersive analysis of KLμ3 and KLe3 scalar and vector form factors using KTeV data

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. D 81, 052001 – Published 4 March 2010

Abstract

Using the published KTeV samples of KLπ±eν and KLπ±μν decays, we perform a reanalysis of the scalar and vector form factors based on the dispersive parametrization. We obtain phase-space integrals IKe=0.15446±0.00025 and IKμ=0.10219±0.00025. For the scalar form factor parametrization, the only free parameter is the normalized form factor value at the Callan-Treiman point (C); our best-fit results in lnC=0.1915±0.0122. We also study the sensitivity of C to different parametrizations of the vector form factor. The results for the phase-space integrals and C are then used to make tests of the standard model. Finally, we compare our results with lattice QCD calculations of FK/Fπ and f+(0).

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  • Received 2 June 2009

DOI:https://doi.org/10.1103/PhysRevD.81.052001

©2010 American Physical Society

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Vol. 81, Iss. 5 — 1 March 2010

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