Chiral Perturbation Theory at Two Loops and the Measurement of V_us

2003/04/30 by Johan Bijnens, Bijnens, Johan
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/0304284

4 pages, talk given at 38th Rencontres de Moriond on QCD and High-Energy Hadronic Interactions, Les Arcs, Savoie, France, 22-29 Mar 2003

arxiv created 2003/04/30 · openalex publication_date 2003/04/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

I give an overview of the calculations done in three-flavour Chiral perturbation theory at next-to-next-to-leading order with an emphasis on those relevant for an improvement in the accuracy of the measurement of V_us. It is pointed out that all needed low energy constants can be obtained from experiment via the scalar form-factor in K_ℓ3 decays

Related

• K_l3 and pi_e3 decays: radiative corrections and CKM unitarity
• Status of chiral perturbation theory for light mesons
• K_L -> pi pi e e in Chiral Perturbation Theory
• Chiral Perturbation Theory at Finite Volume and/or with Twisted Boundary Conditions
• Chiral perturbation theory confronted with experiment