Speaker
Description
A number of excesses observed in LHC data have motivated the hypothesis of a new Higgs-like scalar with a mass near 152 GeV. This presentation will begin with a brief introduction to the history of the 152 GeV candidate, from the multi-lepton anomalies and the prediction of a scalar mass near 150 GeV to the subsequent excesses observed in the \gamma\gamma, Z\gamma, and WW channels.
The main focus will be an update on the current status of the 152 GeV candidate and recent phenomenological developments. In particular, excesses in the \ell\ell\gamma final state were predicted as part of the emerging phenomenological framework, and recent studies of LHC data now reveal excesses consistent with these predictions. The presentation will also discuss recent studies of the \gamma\gamma jj final state and how these results contribute to the developing picture of the 152 GeV candidate.
Finally, recent results on the implications for the CEPC will be presented. Explaining the pattern of excesses observed at the LHC requires an extension of the scalar sector that, in addition to the neutral scalar near 152 GeV, contains a charged scalar state. The existence of this charged scalar is therefore a prediction of the framework used to account for the LHC data. Its discovery is extremely challenging at the LHC because of the large associated backgrounds, whereas the clean experimental environment of the CEPC provides a unique opportunity to discover this charged component. The CEPC can therefore play a decisive role by directly probing a key prediction of the scalar-sector extension associated with the 152 GeV candidate.
