The 95.4 GeV di-photon excess at ATLAS and CMS

Abstract

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 $1.7\sigma$. The results are compatible with a previously reported excess at the same mass, but somewhat higher significance of $2.9\sigma$, 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 ${\mu }_{\gamma \gamma }^{\mathrm{ATLAS}+\mathrm{CMS}}=0.24_{-0.08}^{+0.09}$, corresponding to an excess of $3.1\sigma$. 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.

v.1: 9 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:2303.12018, v.2: slight change in the expected, observed exclusion and limits signal strength of ATLAS due to change in SM reference cross section, conclusions unchanged, v.3: 15 pages, 2 figures, added two tables with detailed information about best-fit points, matches published version

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