Axion-electron decoupling in nucleophobic axion models

Abstract

The strongest upper bounds on the axion mass come from astrophysical observations like the neutrino burst duration of SN1987A, which depends on the axion couplings to nucleons, or the white-dwarf cooling rates and red-giant evolution, which involve the axion-electron coupling. It has been recently argued that in variants of DFSZ models with generation-dependent Peccei-Quinn charges an approximate axion-nucleon decoupling can occur, strongly relaxing the SN1987A bound. However, as in standard DFSZ models, the axion remains in general coupled to electrons, unless an ad hoc cancellation is engineered. Here we show that axion-electron decoupling can be implemented without extra tunings in DFSZ-like models with three Higgs doublets. Remarkably, the numerical value of the quark mass ratio $m_u/m_d\sim 1/2$ is crucial to open up this possibility.

arXiv comment5 pages, 1 figure

References in corpus (8)

• The QCD axion, precisely
• Supernova 1987A Constraints on Sub-GeV Dark Sectors, Millicharged Particles, the QCD Axion, and an Axion-like Particle
• Improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung
• Redefining the Axion Window
• Stellar Recipes for Axion Hunters
• What is the scale of new physics behind the $B$-flavour anomalies?
• Astrophobic Axions
• $U(1)$ flavour symmetries as Peccei-Quinn symmetries

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