Modeling interactions of photons with pseudoscalar and vector mesons

TL;DR

This paper develops a resonance chiral symmetric model incorporating SU(3) breaking to describe photon interactions with mesons, fitting experimental data and predicting contributions to muon magnetic moment with quantified uncertainties.

Contribution

The paper introduces a novel resonance chiral symmetric model with SU(3) breaking, fitted to data, and predicts light-by-light contributions to muon g-2, implemented into Monte Carlo generators.

Findings

Predicted light-by-light contribution to muon g-2: (82.8 ± 3.4)×10^{-11}

Model successfully fitted to experimental data

Implemented into Monte Carlo event generators Ekhara and Phokhara

Abstract

We model interaction of photons, pseudoscalars and vector mesons within the resonance chiral symmetric theory with the SU(3) breaking. The couplings of the model are fitted to the experimental data. Within the developed model we predict the light-by-light contributions to the muon anomalous magnetic moment $a_{\mu}^P = (82.8 \pm 3.4)\times 10^{-11}$. The error covers also the model dependence within the class of models considered in this paper. The model was implemented into the Monte Carlo event generator Ekhara to simulate the reactions $e^+e^-\to e^+e^- P$, $P=\pi^0,\eta,\eta'$ and into the Monte Carlo event generator Phokhara to simulate the reactions $e^+e^-\to P\gamma(\gamma)$.