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 …

We review how the muon anomalous magnetic moment (g− 2) and the quest for lepton flavor
violation are intimately correlated. Indeed the decay μ→ e γ is induced by the same …

A bstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-
energy extensions of the Standard Model (SM). We investigate the phenomenology of an …

Charged lepton flavour-violating transitions would be a clear signal of new physics beyond
the Standard Model. Their search has been carried out in a variety of channels, the most …

Axionlike particles (ALPs) with lepton-flavor-violating couplings can be probed in exotic
muon and tau decays. The sensitivity of different experiments depends strongly on the ALP …

Scattering and decay processes of thermal bath particles involving heavy leptons can dump
hot axions in the primordial plasma around the QCD phase transition. We compute their relic …

A bstract We assess the status of past and future experiments on lepton flavor violating (LFV)
muon and tau decays into a light, invisible, axion-like particle (ALP), a. We propose a new …

Precise measurements of the lepton properties provide stringent tests of the Standard Model
and accurate determinations of its parameters. We overview the present status of τ physics …

A bstract We propose a minimal extension of the standard model which includes only one
additional complex scalar field, flavon, with flavor-dependent global U (1) symmetry. It not …

We develop a perturbative framework with which to discuss departures from exact Lorentz
invariance and explore their potentially observable ramifications. Tiny noninvariant terms …