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Looking forward to Lepton-flavor-violating ALPs
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abstract
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 experimental setup for MEG II, the MEGII-fwd, with a forward calorimeter placed downstream from the muon stopping target. Searching for $\mu \to e a$ decays MEGII-fwd is maximally sensitive to LFV ALPs, if these have nonzero couplings to right-handed leptons. The experimental set-up suppresses the (left-handed) Standard Model background in the forward direction by controlling the polarization purity of the muon beam. The reach of MEGII-fwd is compared with the present constraints, the reach of Mu3e and the Belle-II reach from $\tau \to \ell a$ decays. We show that a dedicated experimental campaign for LFV muon decays into ALPs at MEG II and Mu3e will be able to probe the ALP parameter space in an unexplored region well beyond the existing astrophysical constraints. We study the implications of these searches for representative LFV ALP models, where the presence of a light ALP is motivated by neutrino masses, the strong CP problem and/or the SM flavor puzzle. To this extent we discuss the majoron in low-scale seesaw setups and introduce the LFV QCD axion, the LFV axiflavon and the leptonic familon, paying particular attention to the cases where the LFV ALPs constitute cold dark matter.
Forward citations
Cited by 8 Pith papers
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Neutron stars can shine a light on elusive lepton-flavor-violating dark matter
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Long-lived Axion-Like Particles from Tau Decays
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ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
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Same-sign dimuon probe of charged lepton flavor violation at electron-photon colliders
Electron–photon collisions are shown to probe axionlike-particle e–mu flavor-violating couplings via a same-sign dimuon signature, with projected sensitivity one to two orders below current bounds.
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Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model
Recasting axion limits onto the one-loop H3 couplings of the minimal left-right symmetric model excludes the right-handed scale up to 2×10^9 GeV and could eventually probe 6×10^11 GeV.
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Improved cosmological constraints on axion-lepton interactions
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Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC
Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.
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Axions and Axion-like particles: collider searches
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