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 …

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 …

New Particles Beyond the Standard Model have always been thought to be charged under
at least some of the same gauge interactions of ordinary particles. Although this assumption …

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 …

A bstract We examine the low-energy signatures of axion-like particles (ALPs) in lep-ton
flavor violating (LFV) processes. By using a dimension-5 effective Lagrangian, we compute …

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 …

A detailed discussion is given of the analysis of recent data to obtain improved upper
bounds on the couplings| U e 4| 2 and| U μ 4| 2 for a mainly sterile neutrino mass eigenstate …

A bstract We study the sensitivity of the existing MEG data to lepton flavor violating axion-like
particles produced through μ+→ e+ aγ and estimate the discovery potential for the upcoming …

A bstract We present a QCD axion model where the couplings of the axion to nucleons,
electrons, and muons are naturally suppressed because of the appropriate choice of the …

A bstract Recently, it was pointed out that the electron and muon g− 2 discrepancies can be
explained simultaneously by a single flavor-violating axion-like particle (ALP). We show that …