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

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, R. A. Gomes, P. Gouffon, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. Kotera, A. LedovskoyP. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich, Véronique Bernard, Micaela Oertel, Emilie Passemar, Jan Stern

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24 Scopus citations


Using the published KTeV samples of KL→π±e "ν and KL→π±μ "ν 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).

Original languageEnglish (US)
Article number052001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number5
StatePublished - Mar 4 2010
Externally publishedYes


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