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 …

The Majorana nature of neutrinos is strongly motivated from the theoretical and
phenomenological point of view. A plethora of neutrino mass models, known collectively as …

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 …

Abstract Particles beyond the Standard Model (SM) can generically have lifetimes that are
long compared to SM particles at the weak scale. When produced at experiments such as …

The Majorana nature of neutrinos can be experimentally verified only via lepton-number
violating processes involving charged leptons. We study 36 lepton-number violating (LV) …

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 …

While all models of Majorana neutrino masses lead to the same dimension five effective
operator, which does not conserve lepton number, the dimension six operators induced at …

We investigate the LHC discovery potential for electroweak scale heavy neutrino singlets
(seesaw I), scalar triplets (seesaw II) and fermion triplets (seesaw III). For seesaw I we …

The observation of neutrino oscillations and hence non-zero neutrino masses provided a
milestone in the search for physics beyond the Standard Model. But even though we now …

We demonstrate how to systematically test a well-motivated mechanism for neutrino mass
generation (Type-II seesaw) at the LHC, in which a Higgs triplet is introduced. In the …