Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data
- 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.
DOIAbstract
9 pages, 3 figures, to be published in PRDInternational audienceUsing 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...
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