In this work, the Standard Model (SM) is
extended with two right-handed (RH) neutrinos and two
singlet neutral fermions to yield active neutrino masses via
(2,2) inverse see-saw mechanism. We first validate the multi-
dimensional model parameter space with neutrino oscillation
data, obeying the experimental bounds coming from the lep-
ton flavor violating (LFV) decays: μ → eγ, τ → eγ, τ...
The 2025 ESPPU highlights the extended characterization of the Higgs potential as a priority for future experiments, as it allows the determination of the Standard Model vacuum stability and the test of various Beyond Standard Model hypotheses, paving the way for the study of the electroweak phase transition in the early Universe. A 10 TeV Muon Collider is predicted to produce O(10^4) double...
Sub-GeV light dark matter usually requires the existence of new light mediators, such as the dark Z boson in the $L_\mu - L_\tau$ gauge theory. Here we study the search potential for such a Z' boson based on a muon on-target experiment proposal, through $\mu e^- \to \mu e^- X$, with X decays invisibly. The experimental signature would be scattered muon and electron from the target, at large...
We study the most general Lagrangian for muon decay at low energies, including light Dirac right-handed neutrinos ($\nu$WEFT), in the COHERENT experiment at the Spallation Neutron Source at Oak Ridge National Laboratory. Using the COHERENT data, we derive the first direct constraint on the Michel parameters governing the $\bar\nu_\mu$ energy distribution. We also discuss future sensitivities...
True muonium (TM), the bound state of a muon and an antimuon, remains unobserved due to its short lifetime and production cross-sections, together with its extremely high (13$Z^2$) dissociation cross-section in matter. Recent theoretical and experimental studies have, however, identified feasible pathways to its discovery at current high-energy physics facilities.
At the LHCb experiment,...
The FAMU experiment aims at measuring the Zemach radius of the proton with an accuracy better than 1% through accurate spectroscopy of the ground state hyperfine splitting of muonic hydrogen atoms. This measurement plays a crucial role in validating high-precision QED calculations, and testing the proton-muon interaction. Muonic hydrogen atoms are produced by injecting a pulsed low-momentum...
