High Quality QCD Axion and the LHC

The QCD axion provides an elegant solution to the strong CP problem. While the minimal realization is vulnerable to the so-called “axion quality problem,” we will consider a more robust realization in the presence of a mirror sector related to the standard model by a (softly broken) Z2 symmetry. We...

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Autores principales: Hook, Anson, Kumar, Soubhik, Liu, Zhen, Sundrum, Raman
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.124.221801
http://cds.cern.ch/record/2729748
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author Hook, Anson
Kumar, Soubhik
Liu, Zhen
Sundrum, Raman
author_facet Hook, Anson
Kumar, Soubhik
Liu, Zhen
Sundrum, Raman
author_sort Hook, Anson
collection CERN
description The QCD axion provides an elegant solution to the strong CP problem. While the minimal realization is vulnerable to the so-called “axion quality problem,” we will consider a more robust realization in the presence of a mirror sector related to the standard model by a (softly broken) Z2 symmetry. We point out that the resulting “heavy” axion, while satisfying all theoretical and observational constraints, has a large and uncharted parameter space, which allows it to be probed at the LHC as a long-lived particle (LLP). The small defining axionic coupling to gluons results in a challenging hadronic decay signal which we argue can be distinguished against the background in such a long-lived regime, and yet, the same coupling allows for sufficient production at the hadron colliders thanks to the large gluon-parton luminosity. Our study opens up a new window towards accelerator observable axions and, more generally, singly produced LLPs.
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spelling cern-27297482023-09-11T03:42:21Zdoi:10.1103/PhysRevLett.124.221801doi:10.1103/PhysRevLett.124.221801http://cds.cern.ch/record/2729748engHook, AnsonKumar, SoubhikLiu, ZhenSundrum, RamanHigh Quality QCD Axion and the LHChep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyThe QCD axion provides an elegant solution to the strong CP problem. While the minimal realization is vulnerable to the so-called “axion quality problem,” we will consider a more robust realization in the presence of a mirror sector related to the standard model by a (softly broken) Z2 symmetry. We point out that the resulting “heavy” axion, while satisfying all theoretical and observational constraints, has a large and uncharted parameter space, which allows it to be probed at the LHC as a long-lived particle (LLP). The small defining axionic coupling to gluons results in a challenging hadronic decay signal which we argue can be distinguished against the background in such a long-lived regime, and yet, the same coupling allows for sufficient production at the hadron colliders thanks to the large gluon-parton luminosity. Our study opens up a new window towards accelerator observable axions and, more generally, singly produced LLPs.The QCD axion provides an elegant solution to the Strong CP Problem. While the minimal realization is vulnerable to the so-called "Axion Quality Problem", we will consider a more robust realization in the presence of a mirror sector related to the Standard Model by a (softly broken) $\mathbb{Z}_2$ symmetry. We point out that the resulting "heavy" axion, while satisfying all theoretical and observational constraints, has a large and uncharted parameter space which allows it to be probed at the LHC as a Long-Lived Particle (LLP). The small defining axionic coupling to gluons results in a challenging hadronic decay signal which we argue can be distinguished against the background in such a long-lived regime, and yet, the same coupling allows for sufficient production at hadron colliders thanks to the large gluon parton luminosity. Our study opens up a new window towards accelerator observable axions, and more generally, singly produced LLPs.arXiv:1911.12364UMD-PP-019-07oai:cds.cern.ch:27297482019-11-27
spellingShingle hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
Hook, Anson
Kumar, Soubhik
Liu, Zhen
Sundrum, Raman
High Quality QCD Axion and the LHC
title High Quality QCD Axion and the LHC
title_full High Quality QCD Axion and the LHC
title_fullStr High Quality QCD Axion and the LHC
title_full_unstemmed High Quality QCD Axion and the LHC
title_short High Quality QCD Axion and the LHC
title_sort high quality qcd axion and the lhc
topic hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevLett.124.221801
https://dx.doi.org/10.1103/PhysRevLett.124.221801
http://cds.cern.ch/record/2729748
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AT kumarsoubhik highqualityqcdaxionandthelhc
AT liuzhen highqualityqcdaxionandthelhc
AT sundrumraman highqualityqcdaxionandthelhc