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Title: Axion-electron decoupling in nucleophobic axion models
Author: Björkeroth, Fredrik
Luzio, Luca Di
Mescia, Federico
Nardi, Enrico
Panci, Paolo
Ziegler, Robert
Keywords: Física de partícules
Anomalies (Astronomia)
Particle physics
Anomalies (Astronomy)
Issue Date: 19-Feb-2020
Publisher: American Physical Society
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 Dine-Fischler-Srednicki-Zhitnitsky (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 ∼ 1 / 2 is crucial to open up this possibility.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2020, vol. 101, num. 3, p. 035027
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ISSN: 2470-0010
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))
Articles publicats en revistes (Física Quàntica i Astrofísica)

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