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 …

Rare meson decays are among the most sensitive probes of both heavy and light new
physics. Among them, new physics searches using kaons benefit from their small total decay …

Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting
the full scientific potential of the CERN's accelerator complex and scientific infrastructures …

Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing
neutral currents, thus motivating QCD axion searches at precision flavor experiments. We …

This biennial Review summarizes much of particle physics. Using data from previous
editions, plus 2158 new measurements from 551 papers, we list, evaluate, and average …

The rare decay KL→ π 0 ν ν¯ was studied with the dataset taken at the J-PARC KOTO
experiment in 2016, 2017, and 2018. With a single event sensitivity of (7.20±0.0 5 stat±0.6 6 …

A search for the rare decay KL→ π 0 ν ν¯ was performed. With the data collected in 2015,
corresponding to 2.2× 10 19 protons on target, a single event sensitivity of (1.30±0.0 1 …

We consider a simple extension of the Standard Model (SM) by a complex scalar doublet
and a singlet along with three sterile neutrinos. The sterile neutrinos mix with the SM …

Experiment E949 at Brookhaven National Laboratory has observed three new events
consistent with the decay K+→ π+ ν ν¯ in the pion momentum region 140< P π< 199 MeV/c …

These lectures describe in detail the effective Hamiltonians for weak decays of mesons
constructed by means of the operator product expansion and the renormalization group …