Improved KL->pi e nu Form Factor and Phase Space Integral with Reduced Model Uncertainty

Abstract

Using the published KTeV sample of 2 million KL-> pi e nu decays and a new form factor expansion with a rigorous bound on higher order terms, we present a new determination of the KL->pi e nu form factor and phase space integral. Compared to the previous KTeV result, the uncertainty in the new form factor expansion is negligible and results in an overall uncertainty in the phase space integral (IKe) that is a factor of two smaller: IKe = 0.15392 +- 0.00048 \.

3 pages, 2 figures, submitted to PRD Rapid Communication

References in corpus (2)

• Measurements of Semileptonic KL Decay Form Factors
• Constraints on the form factors for K --> pi l nu and implications for V_us

Cited by in corpus (4)

• Dispersive representation and shape of the Kl3 form factors: robustness
• Radiative corrections to semileptonic beta decays: Progress and challenges
• Dispersive analysis of K_{L mu3} and K_{L e3} scalar and vector form factors using KTeV data
• Improving the phenomenology of K_{l3} form factors with analyticity and unitarity