Leptonic Meson Decays into Invisible ALP

Abstract

The theoretical calculation of pseudo-scalar leptonic decay widths into an invisible ALP, $M\to \ell {\nu }_{\ell }a$, is reviewed. Assuming generic flavour-conserving ALP couplings to SM fermions and a generic ALP mass, $m_a$, the latest experimental results for pseudo-scalar leptonic decays are used to provide updated bounds on the ALP-fermion Lagrangian sector. Constrains on the ALP-quark couplings obtained from these channels are not yet competitive with the ones derived from FCNC processes, like $M\to Pa$ decays. These leptonic decays can, however, provide the most stringent model-independent upper bounds on ALP-leptons couplings for $m_a$ in the (sub)-GeV range.

15 pages, 5 figures, 2 tables

References in corpus (11)

• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Revised constraints and Belle II sensitivity for visible and invisible axion-like particles
• Redefining the Axion Window
• Evidence for B- -> tau- nu_tau-bar with a Hadronic Tagging Method Using the Full Data Sample of Belle
• A New Flavor of Searches for Axion-Like Particles
• Supernova bound on Axion-Like Particles coupled with electrons
• A fresh look at ALP searches in fixed target experiments
• Search for $B^{+}\to {\mu }^{+}{\nu }_{\mu }$ and $B^{+}\to {\mu }^{+}N$ with inclusive tagging
• Measurement of the charged kaon lifetime with the KLOE detector
• Search for a feebly interacting particle $X$ in the decay $K^{+}\to {\pi }^{+}X$
• Revisiting $K\to \pi a$ decays

Cited by in corpus (7)

• ALP production in weak mesonic decays
• Probing HNL-ALP couplings at colliders
• S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs Inflation Extended for Dirac Neutrinos
• Hunting for a 17 MeV particle coupled to electrons
• ALPs and HNLs at LHC and Muon Colliders: Uncovering New Couplings and Signals
• Visible GeV ALP from TeV Vector-like Leptons
• Constraints on axion-like particles using lattice QCD calculations of the rate for $J/\psi \to \gamma a$