Axial vector Z′ and anomaly cancellation

Whilst the prospect of new Z′ gauge bosons with only axial couplings to the Standard Model (SM) fermions is widely discussed, examples of anomaly-free renormalisable models are lacking in the literature. We look to remedy this by constructing several motivated examples. Specifically, we consider axi...

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Main Authors: Ahmed Ismail, Wai-Yee Keung, Kuo-Hsing Tsao, James Unwin
Format: Article
Language:English
Published: Elsevier 2017-05-01
Series:Nuclear Physics B
Online Access:http://www.sciencedirect.com/science/article/pii/S0550321317300810
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spelling doaj-618b0fe8278245db93cd3e756b6a23c02020-11-25T00:36:43ZengElsevierNuclear Physics B0550-32131873-15622017-05-01918C22024410.1016/j.nuclphysb.2017.03.001Axial vector Z′ and anomaly cancellationAhmed Ismail0Wai-Yee Keung1Kuo-Hsing Tsao2James Unwin3Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USADepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USADepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USADepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USAWhilst the prospect of new Z′ gauge bosons with only axial couplings to the Standard Model (SM) fermions is widely discussed, examples of anomaly-free renormalisable models are lacking in the literature. We look to remedy this by constructing several motivated examples. Specifically, we consider axial vectors which couple universally to all SM fermions, as well as those which are generation-specific, leptophilic, and leptophobic. Anomaly cancellation typically requires the presence of new coloured and charged chiral fermions, and we argue that in a large class of models masses of these new states are expected to be comparable to that of the axial vector. Finally, an axial vector mediator could provide a portal between SM and hidden sector states, and we also consider the possibility that the axial vector couples to dark matter. If the dark matter relic density is set due to freeze-out via the axial vector, this strongly constrains the parameter space.http://www.sciencedirect.com/science/article/pii/S0550321317300810
collection DOAJ
language English
format Article
sources DOAJ
author Ahmed Ismail
Wai-Yee Keung
Kuo-Hsing Tsao
James Unwin
spellingShingle Ahmed Ismail
Wai-Yee Keung
Kuo-Hsing Tsao
James Unwin
Axial vector Z′ and anomaly cancellation
Nuclear Physics B
author_facet Ahmed Ismail
Wai-Yee Keung
Kuo-Hsing Tsao
James Unwin
author_sort Ahmed Ismail
title Axial vector Z′ and anomaly cancellation
title_short Axial vector Z′ and anomaly cancellation
title_full Axial vector Z′ and anomaly cancellation
title_fullStr Axial vector Z′ and anomaly cancellation
title_full_unstemmed Axial vector Z′ and anomaly cancellation
title_sort axial vector z′ and anomaly cancellation
publisher Elsevier
series Nuclear Physics B
issn 0550-3213
1873-1562
publishDate 2017-05-01
description Whilst the prospect of new Z′ gauge bosons with only axial couplings to the Standard Model (SM) fermions is widely discussed, examples of anomaly-free renormalisable models are lacking in the literature. We look to remedy this by constructing several motivated examples. Specifically, we consider axial vectors which couple universally to all SM fermions, as well as those which are generation-specific, leptophilic, and leptophobic. Anomaly cancellation typically requires the presence of new coloured and charged chiral fermions, and we argue that in a large class of models masses of these new states are expected to be comparable to that of the axial vector. Finally, an axial vector mediator could provide a portal between SM and hidden sector states, and we also consider the possibility that the axial vector couples to dark matter. If the dark matter relic density is set due to freeze-out via the axial vector, this strongly constrains the parameter space.
url http://www.sciencedirect.com/science/article/pii/S0550321317300810
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AT waiyeekeung axialvectorzandanomalycancellation
AT kuohsingtsao axialvectorzandanomalycancellation
AT jamesunwin axialvectorzandanomalycancellation
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