The 95.4 GeV di-photon excess at ATLAS and CMS
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| Format: | Preprint |
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2023
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| author | Biekötter, T. Heinemeyer, S. Weiglein, G. |
| author_facet | Biekötter, T. Heinemeyer, S. Weiglein, G. |
| contents | The ATLAS collaboration has recently reported the results of a low-mass Higgs-boson search in the di-photon final state based on the full Run 2 data set. The results are based on an improved analysis w.r.t. the previous analysis, which included a part of the Run 2 data, with a substantially better sensitivity. The ``model-dependent'' search carried out by ATLAS shows an excess of events at a mass of about 95.4 GeV with a local significance of $1.7\,σ$. The results are compatible with a previously reported excess at the same mass, but somewhat higher significance of $2.9\,σ$, from the CMS collaboration, also based on the full Run 2 data set. Combining the two results (neglecting possible correlations) we find a signal strength of $μ_{γγ}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding to an excess of $3.1\,σ$. In this work, we investigate the implications of this result, updating a previous analysis based solely on the CMS Run 2 data. We demonstrate that the ATLAS/CMS combined di-photon excess can be interpreted as the lightest Higgs boson in a Two-Higgs doublet model that is extended by a complex singlet (S2HDM) of Yukawa types II and IV, while being in agreement with all other experimental and theoretical constraints. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2306_03889 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The 95.4 GeV di-photon excess at ATLAS and CMS Biekötter, T. Heinemeyer, S. Weiglein, G. High Energy Physics - Phenomenology The ATLAS collaboration has recently reported the results of a low-mass Higgs-boson search in the di-photon final state based on the full Run 2 data set. The results are based on an improved analysis w.r.t. the previous analysis, which included a part of the Run 2 data, with a substantially better sensitivity. The ``model-dependent'' search carried out by ATLAS shows an excess of events at a mass of about 95.4 GeV with a local significance of $1.7\,σ$. The results are compatible with a previously reported excess at the same mass, but somewhat higher significance of $2.9\,σ$, from the CMS collaboration, also based on the full Run 2 data set. Combining the two results (neglecting possible correlations) we find a signal strength of $μ_{γγ}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding to an excess of $3.1\,σ$. In this work, we investigate the implications of this result, updating a previous analysis based solely on the CMS Run 2 data. We demonstrate that the ATLAS/CMS combined di-photon excess can be interpreted as the lightest Higgs boson in a Two-Higgs doublet model that is extended by a complex singlet (S2HDM) of Yukawa types II and IV, while being in agreement with all other experimental and theoretical constraints. |
| title | The 95.4 GeV di-photon excess at ATLAS and CMS |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2306.03889 |