The last two decades have witnessed the discovery of a myriad of new and unexpected
hadrons. The future holds more surprises for us, thanks to new-generation experiments …

We explore the sensitivity of photon-beam experiments to axionlike particles (ALPs) with
QCD-scale masses whose dominant coupling to the standard model is either to photons or …

We report measurements of the photon beam asymmetry Σ for the reactions γ ⃗ p→ p π 0
and γ ⃗ p→ p η from the GlueX experiment using a 9 GeV linearly polarized, tagged photon …

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 …

Electron beam fixed target experiments such as NA64 and LDMX use missing energy-
momentum to detect the production of dark matter and other long-lived states. The most …

New data on pion-photoproduction off the proton have been included in the partial-wave
analyses Bonn-Gatchina and SAID and in the dynamical coupled-channel approach Jülich …

The reaction γ N→ η N is studied in the high-energy regime (with photon lab energies E γ
lab> 4 GeV) using information from the resonance region through the use of finite-energy …

Current and future experiments at the high-intensity frontier are expected to produce an
enormous amount of data that needs to be collected and stored for offline analysis. Thanks …

Partial-wave analysis of meson and photon-induced reactions is needed to enable the
comparison of many theoretical approaches to data. In both energy-dependent and …

In the search for exotic mesons, the GlueX Collaboration will soon extract moments of the η
π 0 angular distribution. In the perspective of these results, we generalize the formalism of …