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Dispersive analysis of K {L mu3} and K {L e3} scalar and vector form factors using KTeV data by KTeV collaboration; al., E. Abouzaid et; Bernard, V.; Oertel, M.; Passemar, E.; Stern, J. is a scholarly article available to read on EtoBox.

What is Dispersive analysis of K {L mu3} and K {L e3} scalar and vector form factors using KTeV data about?

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).

Author

KTeV collaboration; al., E. Abouzaid et; Bernard, V.; Oertel, M.; Passemar, E.; Stern, J.

Published

2009

Language

EN