  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. To obtain more
conclusive results we define and test the connection of the Wilson coefficients
in the Higgs and heavy scalar sectors, as suggested by a portal setup.
