Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data

Details Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data

2009-12-07

arxiv.org/abs/0912.1291v1

Phys.Rev.D81:052001,2010

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 3 figures, to be published in PRD

Scientific paper

10.1103/PhysRevD.81.052001

Using the published KTeV samples of K_L --> pi^{\pm} e^{\mp} nu and K_L --> pi^{\pm} mu^{\mp} nu decays [1], we perform a reanalysis of the scalar and vector form factors based on the dispersive parameterization [2,3]. We obtain phase space integrals I^e_K = 0.15446 \pm 0.00025 and I^{mu}_K = 0.10219 \pm 0.00025. For the scalar form factor parameterization, the only free parameter is the normalized form factor value at the Callan-Treiman point (C); our best fit results in ln C = 0.1915 \pm 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 F_K/F_pi and f_+(0).

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