The status of tests of the standard electroweak model and of searches for new physics in
allowed nuclear β decay and neutron decay is reviewed including both theoretical and …

The turn of the 21st century witnessed a sudden shift in our fundamental understanding of
particle physics. While the minimal Standard Model predicts that neutrino masses are …

We report an improved measurement of the free neutron lifetime τ n using the UCN τ
apparatus at the Los Alamos Neutron Science Center. We count a total of approximately 38× …

We assess the status of big-bang nucleosynthesis (BBN) in light of the final Planck data
release and other recent developments, and in anticipation of future measurements. Planck …

We present a precision measurement of the axial-vector coupling constant g A in the decay
of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this …

Recently, the first ever lattice computation of the γ W-box radiative correction to the rate of
the semileptonic pion decay allowed for a reduction of the theory uncertainty of that rate by a …

We propose a novel dispersive treatment of the so-called inner radiative correction to the
neutron and nuclear β decay. We show that it requires knowledge of the parity-violating …

An observational program focused on the high redshift (2< z< 6) Universe has the
opportunity to dramatically improve over upcoming LSS and CMB surveys on measurements …

There is a long-standing discrepancy between the neutron lifetime measured in beam and
bottle experiments. We propose to explain this anomaly by a dark decay channel for the …

Experimental studies of neutron decay, n→ pe ν¯, exhibit two anomalies. The first is a 8.6
(2.1) s, roughly 4 σ difference between the average beam measured neutron lifetime, τ n …