Oct 2022 - Sept 2023

Bruce Mellado: Growing Excesses of New Scalars at the Electroweak Scale at the LHC




Abstract:  We combine searches for scalar resonances at the electroweak scale performed by the Large Hadron Collider experiments ATLAS and CMS where persisted excesses have been observed in recent years. Using both the side-bands of Standard Model Higgs analyses as well as dedicated beyond the Standard Model analyses, we find significant hints for new scalars at ~ 95 GeV ( S') and ~152 GeV ( S ). The presence of a  95 GeV scalar is preferred over the Standard Model hypothesis by  3.8 sigma , while interpreting the  152 GeV excesses in a simplified model with resonant pair production of  S  via a new heavier scalar  H(270) , a global significance of ~5sigma  is obtained. While the production mechanism of the  S' cannot yet be determined, data strongly favours the associated production of  S , i.e.~via the decay of a heavier boson  H  ( pp-> H-> SS* ). A possible alternative or complementary decay chain is  H-> SS', where  S-> WW* ( S') would be the source of the leptons ( b-quarks) necessary to explain the multi-lepton anomalies found in Large Hadron Collider data.



Zoom Meeting ID: 948 7183 3595