2007/10/30 by F. Ambrosino, KLOE Collaboration, A. Antonelli +74 · 1 citation
Mathematics · Physics and Astronomy · #Cabibbo–Kobayashi–Maskawa matrix #Detector #High-Energy Particle Collisions Research #Lattice (music) #Lepton #Mathematics #Meson #Nuclear physics #Optics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudovector #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Scalar (mathematics) #Universality (dynamical systems) #hep-ex
paper · pdf · doi:10.1088/1126-6708/2007/12/105
published as JHEP 0712:105,2007
arxiv created 2007/10/30 · openalex publication_date 2007/12/31 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using 328 pb-1of data collected at DAFNE corresponding to ∼ 1.8 million KL→ πμν decays, we have measured the Kμ3 form factor parameters. The structure of the K-π vector-current provides information about the dynamics of the strong interaction; its knowledge is necessary for evaluation of the phase-space integral required for measuring the CKM matrix element Vus and for testing lepton universality in kaon decays. Using a new parametrization for the vector and scalar form factors, we find λ+=\pt(25.7± 0.6),-3, and λ0=\pt(14.0± 2.1),-3,. Our result for λ0, together with recent lattice calculations of fπ, fK and f(0), satisfies the Callan-Trieman relation