Indications for extra scalars at LHC? -- BSM physics at future $e^+e^-$ colliders

Understand

This paper intends to collect available data on searches for scalar resonances at LHC.

• It is suggested that, in the absence of SUSY, the most compelling picture is the composite framework, with the idea that the lightest particles are composite scalars of the pseudo-Nambu-Goldstone type, emerging from a broken symmetry at a higher scale, the h(125) boson being one of them.
• Searches in two-photons, Z-photon, ZZ into 4 leptons, top, h and W pairs are reviewed.
• A recent search based on lepton tagging from a spectator W/Z is also discussed.