Speaker
Description
Two-pion production from photon-photon fusion plays a key role in many physical processes, such as studying the substructure of the scalar mesons or constraining the hadronic contribution of the muon’s anomalous magnetic moment. A new theoretical framework has been developed which maps the $\gamma^{\star} \gamma^{\star} \to \pi\pi$ amplitude to finite-volume matrix elements that can be computed using Lattice QCD. In this talk, I will outline how this new formalism can be implemented for the case of scalar resonances, where glueball candidates are expected to populate the spectrum. By computing the appropriate matrix elements and necessary $\pi\pi$ scattering processes, these scalar resonance to two-photon couplings can be determined from first-principles QCD.
