Higgs Decays to $Zγ$ and $γγ$ in the Flavor-Gauged Two Higgs Doublet Model
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866914493632610304 |
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| author | Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong |
| author_facet | Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong |
| contents | This work examines the $h\to Zγ$ and $h\toγγ$ decays in the flavor-gauged two Higgs doublet model (FG2HDM), which augments the Standard Model (SM) with an additional scalar doublet, a singlet, and a $U(1)'$ flavor gauge symmetry. Beyond the SM spectrum, FG2HDM predicts five additional physical scalars and a new neutral gauge boson, $Z'$. We demonstrate that while both decay channels are sensitive to charged Higgs loops, $h \to Zγ$ is uniquely modified by fermion-antifermion-$Z$ ($f\bar{f}Z$) vertex corrections. These vertex corrections further impact top-quark observables and the flavor-changing neutral current (FCNC) process $b\to s\ell^+\ell^-$. Our analysis identifies a viable parameter space ($m_{H^\pm}>200$~GeV and $λ_{hH^+H^-}<0$) consistent with current $1σ$ experimental limits, where the signal strength $μ_{γγ}$ remains the primary constraint on scalar sector parameters. Regarding the $f\bar{f}Z$ couplings, we delineate the allowed regions in the $\mathcal{Q}_{tL}$-$\mathcal{Q}_{tR}$ plane by evaluating the leading top-quark contributions, revealing that $b\to s\ell^+\ell^-$ imposes the most stringent bounds. Finally, we highlight that the $14\%$ projected precision for $μ_{Zγ}$ at the High-Luminosity LHC (HL-LHC) will significantly enhance sensitivity to the FG2HDM. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_18540 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Higgs Decays to $Zγ$ and $γγ$ in the Flavor-Gauged Two Higgs Doublet Model Chen, Feng-Zhi Wen, Qiaoyi Xu, Fanrong High Energy Physics - Phenomenology High Energy Physics - Experiment This work examines the $h\to Zγ$ and $h\toγγ$ decays in the flavor-gauged two Higgs doublet model (FG2HDM), which augments the Standard Model (SM) with an additional scalar doublet, a singlet, and a $U(1)'$ flavor gauge symmetry. Beyond the SM spectrum, FG2HDM predicts five additional physical scalars and a new neutral gauge boson, $Z'$. We demonstrate that while both decay channels are sensitive to charged Higgs loops, $h \to Zγ$ is uniquely modified by fermion-antifermion-$Z$ ($f\bar{f}Z$) vertex corrections. These vertex corrections further impact top-quark observables and the flavor-changing neutral current (FCNC) process $b\to s\ell^+\ell^-$. Our analysis identifies a viable parameter space ($m_{H^\pm}>200$~GeV and $λ_{hH^+H^-}<0$) consistent with current $1σ$ experimental limits, where the signal strength $μ_{γγ}$ remains the primary constraint on scalar sector parameters. Regarding the $f\bar{f}Z$ couplings, we delineate the allowed regions in the $\mathcal{Q}_{tL}$-$\mathcal{Q}_{tR}$ plane by evaluating the leading top-quark contributions, revealing that $b\to s\ell^+\ell^-$ imposes the most stringent bounds. Finally, we highlight that the $14\%$ projected precision for $μ_{Zγ}$ at the High-Luminosity LHC (HL-LHC) will significantly enhance sensitivity to the FG2HDM. |
| title | Higgs Decays to $Zγ$ and $γγ$ in the Flavor-Gauged Two Higgs Doublet Model |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.18540 |