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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2017-05-01
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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 |
work_keys_str_mv |
AT ahmedismail axialvectorzandanomalycancellation AT waiyeekeung axialvectorzandanomalycancellation AT kuohsingtsao axialvectorzandanomalycancellation AT jamesunwin axialvectorzandanomalycancellation |
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1725304015573483520 |