What is the origin of the oxygen we breathe, the hydrogen and oxygen (in form of water
H2O) in rivers and oceans, the carbon in all organic compounds, the silicon in electronic …

We review the theory and phenomenology of isosinglet vector-like quarks (VLQs). In recent
years, interest in VLQs has been increasing, due to their contributions to new physics effects …

Abstract We present new Big Bang Nucleosynthesis (BBN) limits on the cosmic expansion
rate or relativistic energy density, quantified via the number N ν of equivalent neutrino …

Precision tests of first-row unitarity of the Cabibbo–Kobayashi–Maskawa matrix currently
display two intriguing tensions, both at the 3σ level. First, combining determinations of V ud …

A bstract There are two tensions related to the Cabibbo angle of the CKM matrix. First, the
determinations of V us from K μ2, K ℓ3, and τ decays disagree at the 3σ level. Second, using …

We present an overview of searches for violation of lepton flavor universality with a focus on
low energy precision probes using π, K, τ, and nuclear beta decays. We review the current …

We study radiative corrections to low-energy charged-current processes involving nucleons,
such as neutron beta decay and (anti) neutrino-nucleon scattering within a top-down …

Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will
be the world's brightest neutron source. As such, it has the potential for a particle physics …

The full optimization of the design and operation of instruments whose functioning relies on
the interaction of radiation with matter is a super-human task, due to the large dimensionality …

The combination of precise determinations of V us and V ud hints toward a violation of the
Cabibbo-Kobayashi-Maskawa matrix first row unitarity at about 3 σ level. Conversely, the …