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Title: Redefining the Axion Window
Author: Luzio, Luca Di
Mescia, Federico
Nardi, Enrico
Keywords: Cosmologia
Partícules (Matèria)
Issue Date: 20-Jan-2017
Publisher: American Physical Society
Abstract: A major goal of axion searches is to reach inside the parameter space region of realistic axion models. Currently, the boundaries of this region depend on somewhat arbitrary criteria, and it would be desirable to specify them in terms of precise phenomenological requirements. We consider hadronic axion models and classify the representations R Q of the new heavy quarks Q . By requiring that (i) the Q 's are sufficiently short lived to avoid issues with long-lived strongly interacting relics, (ii) no Landau poles are induced below the Planck scale; 15 cases are selected which define a phenomenologically preferred axion window bounded by a maximum (minimum) value of the axion-photon coupling about 2 times (4 times) larger than is commonly assumed. Allowing for more than one R Q , larger couplings, as well as complete axion-photon decoupling, become possible.
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It is part of: Physical Review Letters, 2017, vol. 118, num. 3, p. 031801-1-031801-6
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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