Speaker
Description
The analysis of low-energy $e^+e^-$ scattering experiments at electron-positron colliders requires robust and precise Monte Carlo generators, which are essential for precision tests of the Standard Model, such as the dispersive evaluation of the hadronic vacuum polarization contribution to the muon $g−2$. As part of the community-driven initiative RadioMonteCarlow2, we aim to collect these Monte Carlo tools, compare them, and facilitate their access. This initiative has been working on providing the community with codes that are able to produce differential cross-section distributions for processes related to $e^+e^- \to $ leptons and hadrons at center-of-mass energies of a few GeV. In this talk, I will report on the ongoing activities of the initiative and the results of Phase I of this effort, published as 10.21468/SciPostPhysCommRep.9, which presents a detailed comparison of Monte Carlo codes for $e^+e^−$ scattering into muon, pion, and electron pairs, both for energy-scan and radiative-return experiments. This first phase is a theoretical exercise which focuses on comparisons without reference to experimental data, aiming to clarify the importance of different physics effects and approaches in realistic experimental setups.
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