2003/01/31 by S. Pislak, R. Appel, G. S. Atoyan +34 · 121 citations
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Hadron #High-Energy Particle Collisions Research #Mathematics #Optics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Scattering #Statistics #hep-ex
paper · pdf · doi:10.1103/physrevd.67.072004
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 67(7) (American Physical Society) · 15 pages, 10 figures, submitted to Phys. Rev. D
arxiv created 2003/01/31 · openalex publication_date 2003/04/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report experimental details and results of a new measurement of the decay K+\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-e+\ensuremathνe(Ke4). A sample of more than 400,000Ke4 events with low background has been collected by Experiment 865 at the Brookhaven Alternate Gradient Synchrotron. From these data, the branching ratio (4.11\ifmmode±\else\textpm\fi0.01\ifmmode±\else\textpm\fi0.11)\ifmmode×\else\texttimes\fi10^\ensuremath-5 and the \ensuremathπ\ensuremathπ invariant mass dependence of the form factors F,G, and H of the weak hadronic current as well as the phase shift difference \ensuremathδ00\ensuremath-\ensuremathδ11 for \ensuremathπ\ensuremathπ scattering were extracted. Using constraints based on analyticity and chiral symmetry, a new value with considerably improved accuracy for the s-wave \ensuremathπ\ensuremathπ scattering length a00 has been obtained also: a00=0.216\ifmmode±\else\textpm\fi0.013(stat)\ifmmode±\else\textpm\fi0.002(syst)\ifmmode±\else\textpm\fi0.002(theor).