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

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

References in corpus (17)

• Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
• Scalar K pi form factor and light quark masses
• Dispersive representation and shape of the Kl3 form factors: robustness
• Kl3 semileptonic form factor from 2+1 flavour lattice QCD
• K pi vector form factor, dispersive constraints and tau -> nu_tau K pi decays
• What can be learned from the Belle spectrum for the decay tau- -> nu_tau K_S pi-
• Electromagnetic effects in Kl3 decays
• Analyticity constraints on the strangeness changing vector current and applications to $\tau \to K\pi {\nu }_{\tau }$, $\tau \to K\pi \pi {\nu }_{\tau }$
• f_K/f_pi in Full QCD with Domain Wall Valence Quarks
• Matching Chiral Perturbation Theory and the Dispersive Representation of the Scalar Kpi Form Factor
• Tests of non-standard electroweak couplings of right-handed quarks
• Constraints on the form factors for K --> pi l nu and implications for V_us
• The Kl3 scalar form factors in the standard model
• Improved KL->pi e nu Form Factor and Phase Space Integral with Reduced Model Uncertainty
• Chiral Dynamics beyond the Standard Model

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