Seminarium Kosmologia i Fizyka Cząstek

I will review the Twin Higgs scenario as a “dark” solution to the little hierarchy problem, identify the structure of a minimal model and its viable parameter space, and analyze its collider implications. In this model, dark naturalness generally leads to Hidden Valley phenomenology. The twin particles, including the top partner, are all Standard-Model- neutral, but naturalness favors the existence of twin strong interactions – an asymptotically- free force that confines not far above the Standard Model QCD scale – and a Higgs portal interaction. I will show that, taken together, these typically give rise to exotic decays of the Higgs to twin hadrons. Across a substantial portion of the parameter space, certain twin hadrons have visible and often displaced decays, providing a potentially striking LHC signature.