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Title: Experimental targets for photon couplings of the QCD axion

Abstract

The QCD axion’s coupling to photons is often assumed to lie in a narrow band as a function of the axion mass. We demonstrate that several simple mechanisms, in addition to the photophilic clockwork axion already in the literature, can significantly extend the allowed range of couplings. Some mechanisms we present generalize the KNP alignment scenario, widely studied as a model of inflation, to the phenomenology of a QCD axion. In particular we present KSVZ-like realizations of two-axion KNP alignment and of the clockwork mechanism. Such a “confinement tower” realization of clockwork may prove useful in a variety of model-building contexts. We also show that kinetic mixing of the QCD axion with a lighter axion-like particle can dramatically alter the QCD axion’s coupling to photons, differing from the other models we present by allowing non-quantized couplings. The simple models that we present fully cover the range of axion-photon couplings that could be probed by experiments. They motivate growing axion detection efforts over a wide space of masses and couplings.

Authors:
 [1];  [2];  [1];  [3]
  1. Harvard Univ., Cambridge, MA (United States). Dept. of Physics
  2. Brown Univ., Providence, RI (United States). Dept. of Physics
  3. Univ. of Chicago, IL (United States). Dept. of Physics
Publication Date:
Research Org.:
Brown Univ., Providence, RI (United States); Harvard Univ., Cambridge, MA (United States); Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF); National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1501937
Grant/Contract Number:  
SC0010010; SC0013607; SC0013642; PHY-1607611; PHY-0855591; PHY-1216270; NNX16AI12G
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 2; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; nonperturbative effects

Citation Formats

Agrawal, Prateek, Fan, JiJi, Reece, Matthew, and Wang, Lian-Tao. Experimental targets for photon couplings of the QCD axion. United States: N. p., 2018. Web. doi:10.1007/jhep02(2018)006.
Agrawal, Prateek, Fan, JiJi, Reece, Matthew, & Wang, Lian-Tao. Experimental targets for photon couplings of the QCD axion. United States. doi:10.1007/jhep02(2018)006.
Agrawal, Prateek, Fan, JiJi, Reece, Matthew, and Wang, Lian-Tao. Thu . "Experimental targets for photon couplings of the QCD axion". United States. doi:10.1007/jhep02(2018)006. https://www.osti.gov/servlets/purl/1501937.
@article{osti_1501937,
title = {Experimental targets for photon couplings of the QCD axion},
author = {Agrawal, Prateek and Fan, JiJi and Reece, Matthew and Wang, Lian-Tao},
abstractNote = {The QCD axion’s coupling to photons is often assumed to lie in a narrow band as a function of the axion mass. We demonstrate that several simple mechanisms, in addition to the photophilic clockwork axion already in the literature, can significantly extend the allowed range of couplings. Some mechanisms we present generalize the KNP alignment scenario, widely studied as a model of inflation, to the phenomenology of a QCD axion. In particular we present KSVZ-like realizations of two-axion KNP alignment and of the clockwork mechanism. Such a “confinement tower” realization of clockwork may prove useful in a variety of model-building contexts. We also show that kinetic mixing of the QCD axion with a lighter axion-like particle can dramatically alter the QCD axion’s coupling to photons, differing from the other models we present by allowing non-quantized couplings. The simple models that we present fully cover the range of axion-photon couplings that could be probed by experiments. They motivate growing axion detection efforts over a wide space of masses and couplings.},
doi = {10.1007/jhep02(2018)006},
journal = {Journal of High Energy Physics (Online)},
number = 2,
volume = 2018,
place = {United States},
year = {2018},
month = {2}
}

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