Speaker
Oleksandra Deineka
(Johannes Gutenberg University Mainz)
Description
A dispersive implementation of the $a_0(980)$ resonance to (g-2) requires the knowledge of the double-virtual S-wave $\gamma^*\gamma^*\to\pi\eta, K K$ amplitudes. To obtain these amplitudes we used a modified coupled-channel Muskhelishvili–Omnès formalism, with the input from the left-hand cuts and the hadronic Omnès function. The latter we obtained using a data-driven N/D method in which the fits were performed to the different sets of experimental data involving $\pi\eta$ and $KK$ final states.
Primary author
Oleksandra Deineka
(Johannes Gutenberg University Mainz)
Co-authors
Igor Danilkin
(Johannes Gutenberg University Mainz)
Marc Vanderhaeghen
(Johannes Gutenberg University Mainz)
