https://doi.org/10.1051/epjconf/202430301001
Investigation of γ*γ* → η′ at the BESIII Experiment
Institute for Nuclear Physics, Johannes Gutenberg University Mainz
* e-mail: manderso@students.uni-mainz.de
Published online: 25 September 2024
In this analysis, the production of pseudoscalar η′ mesons via two virtual spacelike photons is studied (γ*γ* → η′). Double-tagged measurements are conducted at the BESIII experiment in Beijing, China, in which both virtual photons possess nonzero virtualities Q12 and Q22. The Monte Carlo generator Ekhara 3.0 is used to simulate the expected signal event distribution. By measuring the double differential cross section at BESIII, the transition form factor (TFF) can be determined for Q12, Q22 < 2 GeV2. The TFF of pseudoscalar mesons serves as essential input for calculating the hadronic light-by-light contribution to the theoretical Standard Model prediction of the anomalous magnetic moment of the muon aμ = (gμ − 2)/2.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
