6 papers
ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
Marco Ardu, Lorenzo Calibbi, Marco Fedele +1
In this paper we study axion-like particles (ALPs) with lepton-flavour-violating (LFV) couplings in the mass regime above the muon threshold, , where the strong bound fro…
High-quality Peccei-Quinn symmetry from the interplay of vertical and horizontal gauge symmetries
Luca Di Luzio, Giacomo Landini, Federico Mescia +1
We explore a class of axion models where an accidental Peccei-Quinn (PQ) symmetry automatically emerges from the interplay of vertical (grand-unified) and horizonta…
Fresh look at the diffuse ALP background from supernovae
Francisco R. Candón, Sougata Ganguly, Maurizio Giannotti +3
Protoneutron stars, highly compact objects formed in the core of exploding supernovae (SNe), are powerful sources of axion-like particles (ALPs). In the SN core, ALPs are dominantl…
Accommodating scalar resonances in the HEFT
Iñigo Asiáin, Domènec Espriu, Federico Mescia
Loss of unitarity in an effective field theory is often cured by the appearance of dynamical resonances, revealing the presence of new degrees of freedom. These resonances may mani…
Axion-induced pair production: a new strategy for axion detection
Fernando Arias-Aragón, Maurizio Giannotti, Giovanni Grilli di Cortona +1
We revisit and update the axion-induced pair production process in a nuclear electric field mediated by the axion-electron coupling, $a+{{}^{A}_{Z}X} \rightarrow {{}^{A}_{Z}X} + e^…
Do Finite Density Effects Jeopardize Axion Nucleophobia in Supernovae?
Luca Di Luzio, Vincenzo Fiorentino, Maurizio Giannotti +2
Nucleophobic axion models, wherein axion couplings to both protons and neutrons are simultaneously suppressed, can relax the stringent constraints from SN 1987A. However, it remain…