1. Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data
- Author
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Bernard, V., Oertel, M., Passemar, E., Stern, J., Abouzaid, E., Arenton, M., Barker, A.R., Bellantoni, L., Blucher, E., J. Bock, G., Cheu, E., Coleman, R., Corcoran, M.D., Cox, B., Erwin, A.R., Escobar, C.O., Glazov, A., Gomes, R.A., Gouffon, P., B. Hsiung, Y., Jensen, D.A., Kessler, R., Kotera, K., Ledovskoy, A., L. Mcbride, P., Monnier, E., Nguyen, H., Niclasen, R., Phillips, D.G., Ramberg, E.J., Ray, R.E., Ronquest, M., Santos, E., Slater, W., Smith, D., Solomey, N., C. Swallow, E., A. Toale, P., Tschirhart, R., W. Wah, Y., Wang, J., B. White, H., Whitmore, J., J. Wilking, M., Winston, R., Worcester, E.T., Yamanaka, T., D. Zimmerman, E., Zukanovich, R.F., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
High Energy Physics - Experiment (hep-ex) ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,FOS: Physical sciences ,High Energy Physics - Experiment - Abstract
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)., 9 pages, 3 figures, to be published in PRD
- Published
- 2010
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