The workshop “Shedding light on X17” brings together scientists looking for the existence of
a possible new light particle, often referred to as X17. This hypothetical particle can explain …

Angular correlation spectra of e+ e− pairs produced in the H 3 (p, e+ e−) He 4 nuclear
reaction have been studied at E p= 510, 610, and 900 keV proton energies. The main …

A bstract A new measurement of the muon anomalous magnetic moment, g μ− 2, has been
reported by the Fermilab Muon g-2 collaboration and shows a 4. 2 σ departure from the most …

A bstract In view of the latest experimental results recently released by the ATOMKI
collaboration, we critically re-examine the possible theoretical interpretation of the observed …

We revisit the theory and constraints on axionlike particles (ALPs) interacting with leptons.
We clarify some subtleties in the constraints on ALP parameter space and find several new …

We discuss the leptonic axionlike particle (ALP) portal as a simple scenario that connects
observed discrepancies in anomalous magnetic moments to the dark matter relic …

We show that electron recoils induced by non-relativistic Dark Matter interactions can fit well
the recently reported Xenon1T excess, if they are mediated by a light pseudo-scalar in the …

We investigate the interactions of a light scalar with the Higgs boson and second-generation
fermions, which trigger new rare decays of the Higgs boson into 4μ, 2 μ 2 γ, 6μ and 4 μ 2 j …

A bstract In the past, the axion-nucleon coupling has been calculated in the framework of SU
(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting …

A bstract With a sample of (10087±44)× 10 6 J/ψ events accumulated with the BESIII
detector, we analyze the decays η′→ π+ π− l+ l−(l= e, μ) via the process J/ψ→ γη′. The …