Jun 22 – 27, 2023
Auditorium Maximum
Europe/Warsaw timezone

A dispersive estimate of $a_0(980)$ contribution to hadronic light-by-light scattering in g-2

Jun 22, 2023, 5:10 PM
Medium lecture hall (B) (Auditorium Maximum)

Medium lecture hall (B)

Auditorium Maximum


Oleksandra Deineka (Johannes Gutenberg University Mainz)


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)


Igor Danilkin (Johannes Gutenberg University Mainz) Marc Vanderhaeghen (Johannes Gutenberg University Mainz)

Presentation materials