Explanation of the excesses in associated di-photon production at 152 GeV in 2HDM
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912070889373696 |
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| author | Banik, Sumit Crivellin, Andreas |
| author_facet | Banik, Sumit Crivellin, Andreas |
| contents | Statistically significant excesses exist at around 152 GeV in associated di-photon production ($γγ+X$) in the sidebands of SM Higgs analyses of ATLAS (using the full run-2 dataset). They are most pronounced in the single-$τ$, missing-transverse-energy, four-jet and $\geqslant1\ell+\!\geqslant1b$-jet channels ($\approx3σ$) and can be explained by the Drell-Yan production of new Higgs bosons, i.e. $pp\to W^*\to H^\pm H^0$. We first examine the excesses in a simplified model approach, considering that $H^\pm$ decays to $τν$, $WZ$ or $tb$. Both the $τν$ and $tb$ decay modes individually lead to a significance of $\lessapprox4σ$ while for $WZ$ one can obtain at most $3.5σ$. This is because the decays of $WZ$ lead to multiple leptons contributing to the two-lepton channel which does not show an excess at 152 GeV. Next, we consider two-Higgs-doublet models where the charged Higgs does not decay to $WZ$ at tree-level, finding a significance of $\gtrapprox4σ$ for a branching ratio of the new neutral Higgs to photons of $\approx$2%. Even though this branching fraction is quite sizable, it can be obtained in composite models or via the Lagrangian term $λ_6 H_1^\dagger H_1 H_2^\dagger H_1+{\rm h.c.}$ breaking the commonly imposed $Z_2$ symmetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_06267 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Explanation of the excesses in associated di-photon production at 152 GeV in 2HDM Banik, Sumit Crivellin, Andreas High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory Statistically significant excesses exist at around 152 GeV in associated di-photon production ($γγ+X$) in the sidebands of SM Higgs analyses of ATLAS (using the full run-2 dataset). They are most pronounced in the single-$τ$, missing-transverse-energy, four-jet and $\geqslant1\ell+\!\geqslant1b$-jet channels ($\approx3σ$) and can be explained by the Drell-Yan production of new Higgs bosons, i.e. $pp\to W^*\to H^\pm H^0$. We first examine the excesses in a simplified model approach, considering that $H^\pm$ decays to $τν$, $WZ$ or $tb$. Both the $τν$ and $tb$ decay modes individually lead to a significance of $\lessapprox4σ$ while for $WZ$ one can obtain at most $3.5σ$. This is because the decays of $WZ$ lead to multiple leptons contributing to the two-lepton channel which does not show an excess at 152 GeV. Next, we consider two-Higgs-doublet models where the charged Higgs does not decay to $WZ$ at tree-level, finding a significance of $\gtrapprox4σ$ for a branching ratio of the new neutral Higgs to photons of $\approx$2%. Even though this branching fraction is quite sizable, it can be obtained in composite models or via the Lagrangian term $λ_6 H_1^\dagger H_1 H_2^\dagger H_1+{\rm h.c.}$ breaking the commonly imposed $Z_2$ symmetry. |
| title | Explanation of the excesses in associated di-photon production at 152 GeV in 2HDM |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2407.06267 |