Measurements of the form-factors slopes of KL -> pi mu nu decay with the KLOE Detector

2007/07/31 by KLOE Collaboration
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.0707.4631

openalex publication_date 2007/07/31 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28

Abstract

We present a measurement of the K-π form-factor parameters for the decay \klpmn. We use 328 pb^-1 of data collected in 2001 and 2002, corresponding to ∼ 1.8 million \semil events. Measurements of semileptonic form factors provide information about the dynamics of the strong interaction and are necessary for evaluation of the phase-space integral I^μ_K needed to measure the CKM matrix element |V_us| for \klpmn decays and to test lepton universality in kaon decays. Using a new parameterization for the vector and scalar form factors we find λ₊=\pt(25.6± 0.4_\rmstat.± 0.3_\rmsyst.),-3, and λ₀=\pt(14.3± 1.7_\rmstat.± 1.1_\rmstat.),-3,. In the more usual quadratic expansion of the form factor the above result is corresponds to λ'₊=λ₊, λ''₊=2λ²₊, λ'₀=λ₀ and λ''₀=(λ²₀+0.000416)/2. Our results, together with recent lattice calculations of f_π, f_K and f(0), satisfy the Callan-Trieman relation.

Related

• K -> pi vector form factor with N_f=2+1+1 Twisted Mass fermions
• Unitarity and universality with kaon physics at KLOE
• K -> pi l nu form factors with staggered quarks
• The Kpi vector form factor and constraints from Kl3 decays
• Kobayashi-Maskawa matrix moduli, decay constants and form factors determination from experimental data