Multi-$Z'$ signatures of spontaneously broken local $U(1)'$ symmetry
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910546754797568 |
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| author | Nomura, Takaaki Yagyu, Kei |
| author_facet | Nomura, Takaaki Yagyu, Kei |
| contents | We discuss multi-$Z'$ signatures coming from decays of Higgs bosons in models with a spontaneously broken $U(1)'$ symmetry, which can be observed as "lepton jets" or multi-lepton final states depending on the mass range of new bosons. We consider anomaly-free $U(1)'$ models without introducing new fermions except for right-handed neutrinos, in which the Higgs sector is composed of an isospin doublet and a singlet fields with zero and non-zero $U(1)'$ charges, respectively. The multi-$Z'$ signatures can then be obtained via the decays of the discovered (extra) Higgs boson $h$ ($ϕ$), i.e., $h\to Z'Z'$, $ϕ\to Z'Z'$ and/or $h \to ϕϕ\to 4Z'$ as far as kinematically allowed. We give the upper limit on the branching ratios of $h$ into $Z'Z'$ and $4Z'$ from the current experimental data in each model. We also show the deviation in the $hhh$ coupling from the standard model prediction at one-loop level, and find that its amount is typically smaller than 1\%. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20742 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multi-$Z'$ signatures of spontaneously broken local $U(1)'$ symmetry Nomura, Takaaki Yagyu, Kei High Energy Physics - Phenomenology We discuss multi-$Z'$ signatures coming from decays of Higgs bosons in models with a spontaneously broken $U(1)'$ symmetry, which can be observed as "lepton jets" or multi-lepton final states depending on the mass range of new bosons. We consider anomaly-free $U(1)'$ models without introducing new fermions except for right-handed neutrinos, in which the Higgs sector is composed of an isospin doublet and a singlet fields with zero and non-zero $U(1)'$ charges, respectively. The multi-$Z'$ signatures can then be obtained via the decays of the discovered (extra) Higgs boson $h$ ($ϕ$), i.e., $h\to Z'Z'$, $ϕ\to Z'Z'$ and/or $h \to ϕϕ\to 4Z'$ as far as kinematically allowed. We give the upper limit on the branching ratios of $h$ into $Z'Z'$ and $4Z'$ from the current experimental data in each model. We also show the deviation in the $hhh$ coupling from the standard model prediction at one-loop level, and find that its amount is typically smaller than 1\%. |
| title | Multi-$Z'$ signatures of spontaneously broken local $U(1)'$ symmetry |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2407.20742 |