High statistic measurement of the K−→π0e−ν decay form-factors

2004/04/23 by O. P. Yushchenko, S.A. Akimenko, S. A. Akimenko +30 · 61 citations
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Chromatography #Geometry #Mathematics #Nuclear physics research studies #Particle physics theoretical and experimental studies #Physics #Quadratic equation #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Statistic #Statistics #hep-ex

paper · pdf · doi:10.1016/j.physletb.2004.03.069

published in Physics Letters B 589(3-4), 111-117 (Elsevier BV) · 11 pages, 8 figures. Accepted by Phys.Lett. B

arxiv created 2004/04/23 · openalex publication_date 2004/04/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The decay K- -> pi0 e- nu is studied using in-flight decays detected with the ISTRA+ spectrometer. About 920K events are collected for the analysis. The lambda+ slope parameter of the decay form-factor f+(t) in the linear approximation (average slope) is measured: lambda+(lin)= 0.02774 +- 0.00047(stat) +- 0.00032(syst). The quadratic contribution to the form-factor was estimated to be lambda'+ = 0.00084 +- 0.00027(stat) +- 0.00031(syst). The linear slope, which has a meaning of df+(t)/dt|_t=0 for this fit, is lambda+ = 0.02324 +- 0.00152(stat) +- 0.00032(syst). The limits on possible tensor and scalar couplings are derived: f_T/f₊(0)=-0.012 +- 0.021(stat) +- 0.011(syst), f_S/f₊(0)=-0.0037^+0.0066_-0.0056(stat) +- 0.0041(syst).

Citations

• Kl3 form factors at order p of chiral perturbation theory

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