The Kpi vector form factor and constraints from Kl3 decays

2011/01/14 by Diogo Boito, Boito, Diogo R., Rafel Escribano +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1101.2887

openalex publication_date 2011/01/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The slope and curvature parameters of the Kπ vector form factor, F₊^Kπ, are fitted to the data on \tauKpi and K_l3 decays yielding λ₊'=(25.49 ± 0.31) × 10^-3 and λ₊"= (12.22 ± 0.14) × 10^-4. The pole position of the K^*(892)^± is found to be at m_K^*(892)^±= 892.0± 0.5 MeV and Γ_K^*(892)^±= 46.5 ±1.1 MeV. The phase-space integrals relevant for K_l3 analyses and the P-wave isospin-1/2 Kπ phase-shift threshold parameters are also calculated.

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