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

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

2006-08-25

arxiv.org/abs/hep-ex/0608058v2

Phys.Rev.D74:097101,2006

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 2 figures, submitted to PRD Rapid Communication

Scientific paper

10.1103/PhysRevD.74.097101

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 \.

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