Learning from the New Higgs-like Scalar before It Vanishes

Understand

Motivated by a di-photon anomaly observed by ATLAS and CMS we develop an SFitter analysis for a combined electroweak-Higgs sector, and a scalar portal at the LHC.

• The theoretical description is based on the linear effective Lagrangian for the Higgs and gauge fields, combined with an additional singlet scalar.
• The key feature is the extraction of reliable information on the portal structure of the combined scalar potential.
• For the specific di-photon anomaly we find that the new state might well form such a Higgs portal.