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The ATLAS collaboration has recently reported the results of a low-massHiggs-boson search in the di-photon final state based on the full Run 2 dataset. The results are based on an improved analysis w.r.t. the previousanalysis, which included a part of the Run 2 data, with a substantially bettersensitivity. The ``model-dependent'' search carried out by ATLAS shows anexcess 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 atthe same mass, but somewhat higher significance of $2.9\,\sigma$, from the CMScollaboration, also based on the full Run 2 data set. Combining the two results(neglecting possible correlations) we find a signal strength of$\mu_{\gamma\gamma}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding toan excess of $3.1\,\sigma$. In this work, we investigate the implications ofthis 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 interpretedas the lightest Higgs boson in a Two-Higgs doublet model that is extended by acomplex singlet (S2HDM) of Yukawa types II and IV, while being in agreementwith all other experimental and theoretical constraints.

The 95.4 GeV di-photon excess at ATLAS and CMS