Low-energy meson phenomenology with Resonance Chiral Lagrangians

TL;DR

This paper uses Resonance Chiral Lagrangians to compute low-energy hadronic processes in QCD, aiding the interpretation of experiments searching for new physics phenomena like lepton violations and the muon g-2 anomaly.

Contribution

It applies Resonance Chiral Lagrangians as an effective theory to calculate important low-energy hadronic processes relevant for current and future precision experiments.

Findings

Computed hadronic contributions to muon g-2

Analyzed backgrounds for lepton flavor violation searches

Provided theoretical predictions for upcoming experiments

Abstract

The low energy behaviour of Quantum Chromodynamics makes unreliable an expansion in terms of its coupling strength, since nothing guarantees the convergence of such expansion. To overcomer such difficulty one resorts to Lattice QCD or Effective Field Theories. In this thesis we compute hadronic processes at low energies, using Resonance Chiral Lagrangians as the effective theory of QCD. The processes we study are important background on the search for Lepton Flavor Violation, Lepton Universality Violation, Lepton Number Violation, Second Class Currents and study the Hadronic light-by-light contribution to the Anomalous Magnetic Moment of the muon. All such processes are of great interest since all of them are to be studied with an increased precision in the very near future by different experiments.