Particle physics today faces the challenge of explaining the mystery of dark matter, the origin
of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent …

With the establishment and maturation of the experimental programs searching for new
physics with sizeable couplings at the LHC, there is an increasing interest in the broader …

Pulsar timing arrays (PTAs) have reported evidence for a stochastic gravitational wave (GW)
background at nanohertz frequencies, possibly originating in the early Universe. We show …

We report the results from a haloscope search for axion dark matter in the 3.3–4.2 μ eV mass
range. This search excludes the axion-photon coupling predicted by one of the benchmark …

This report provides an extensive review of the experimental programme of direct detection
searches of particle dark matter. It focuses mostly on European efforts, both current and …

The standard model of particle physics describes the vast majority of experiments and
observations involving elementary particles. Any deviation from its predictions would be a …

We review the landscape of QCD axion models. Theoretical constructions that extend the
window for the axion mass and couplings beyond conventional regions are highlighted and …

Axions are well-motivated dark matter candidates with simple cosmological production
mechanisms. They were originally introduced to solve the strong CP problem, but also arise …

Axions are hypothetical particles that may explain the observed dark matter density and the
non-observation of a neutron electric dipole moment. An increasing number of axion …

This Letter reports on a cavity haloscope search for dark matter axions in the Galactic halo in
the mass range 2.81–3.31 μ eV. This search utilizes the combination of a low-noise …