Searches for scalars at LHC and interpretation of the findings

TL;DR

This paper reviews scalar particle searches at the LHC, focusing on the H(650) resonance, its observed channels, and implications for various extended scalar sector models, highlighting current experimental evidence and theoretical constraints.

Contribution

It provides an updated overview of scalar search results at the LHC, analyzing the H(650) resonance and its interpretations within different scalar sector extensions.

Findings

H(650) resonance observed with about 7 s.d. significance

Models with only SU(2) singlets and doublets are excluded for H(650)

Additional triplet models require extensions beyond Georgi-Machacek

Abstract

In view of the future Higgs factories, this work presents the status of scalar searches at the LHC with an emphasis on the H(650) resonance which has been observed in WW, ZZ and h(95)h(125) channels, with a cumulative evidence of about 7 s.d. global significance. Its interpretation in models, restricted to extension of the scalar sector by SU(2) singlets and doublets, is clearly excluded, while its interpretation in models with additional triplets requires an extension with respect to the conventional Georgi-Machacek model. A general picture of these searches is updated, showing that h(95) is also reaching a similar level of evidence while two other candidates, A(400) and h(151), although less prominent, are above the 4 s.d. global evidence.