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 …

The existence of nonzero neutrino masses points to the likely existence of multiple Standard
Model neutral fermions. When such states are heavy enough that they cannot be produced …

A bstract A search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana
neutrinos, is performed in final states with three charged leptons (electrons or muons) using …

A bstract We make a comparative study of the neutrinoless double beta decay constraints on
heavy sterile neutrinos versus other direct and indirect constraints from both lepton number …

Neutrinos, being the only fermions in the Standard Model of Particle Physics that do not
possess electromagnetic or color charges, have the unique opportunity to communicate with …

A bstract The “Cabibbo Angle Anomaly”(CAA) originates from the disagreement between the
CKM elements V ud and V us extracted from superallowed beta and kaon decays …

A search for charged leptons with large impact parameters using 139 fb− 1 of s= 13 TeV pp
collision data from the ATLAS detector at the LHC is presented, addressing a long-standing …

We for the first time map the range of active-sterile neutrino mixing angles in which
leptogenesis is possible in the type I seesaw model with three heavy neutrinos with …

This document presents the physics case and ancillary studies for the proposed CODEX-b
long-lived particle (LLP) detector, as well as for a smaller proof-of-concept demonstrator …