We review the present status of the Standard Model calculation of the anomalous magnetic
moment of the muon. This is performed in a perturbative expansion in the fine-structure …

Decays of the neutral and long-lived η and η′ mesons provide a unique, flavor-conserving
laboratory to test low-energy Quantum Chromodynamics and search for new physics …

We employ a mathematical framework based on rational approximants in order to calculate
the pseudoscalar-pole piece of the hadronic light-by-light contribution to the anomalous …

Prospects for precise predictions of aµ in the Standard Model arXiv:2203.15810v1 [hep-ph] 29
Mar 2022 Page 1 Submitted to the Proceedings of the US Community Study on the Future of …

We present a search for the e+ e− decay of a hypothetical dark photon, also named U vector
boson, in inclusive dielectron spectra measured by HADES in the p (3.5 GeV)+ p, Nb …

An intense 120 GeV proton beam incident on an extremely long iron target generates
enormous numbers of light-mass particles that also decay within that target. If one of these …

A dispersion integral is derived that connects data on η→ π+ π− γ to the η→ γγ∗ transition
form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the η …

The Dalitz decays η→ e+ e− γ and ω→ π 0 e+ e− have been measured in the γ p→ η p and
γ p→ ω p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron …

The η and η′ transition form factors in the spacelike region are analyzed at low and
intermediate energies in a model-independent way through the use of rational …

The η η transition form factor is analyzed for the first time in both space-and time-like regions
at low and intermediate energies in a model-independent approach through the use of …