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...
Autores principales: | , , , |
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Lenguaje: | eng |
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2019
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Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.124.221801 http://cds.cern.ch/record/2729748 |
_version_ | 1780966429244260352 |
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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. |
id | cern-2729748 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2019 |
record_format | invenio |
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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