Wednesday 16 November 2016 

Speaker: Thomas Flacke (IBS CTPU, Korea)


Title: "Talk to NExT theorist: Hunting for composite, pseudoscalar resonances at the LHC using diboson or top-pair signatures”

Abstract: Models of compositeness can address the Hierarchy problem by realizing the Higgs as a bound state of a theory that becomes strongly coupled in the TeV range. We investigate a class of models that realize a composite Higgs without introducing any elementary scalars. We find that all of these models contain light (TeV scale or below) colored as well as color-neutral pseudo-scalar resonances, which can be searched for at the LHC. In a first step, we derive the coupling-structure and mass relations of the pseudo-scalars from a UV model. In a second step, we describe the new pseudo-scalars in terms of a more model-independent effective field theory (EFT) and use the available ATLAS and CMS searches for resonances in di-jet, top-pair, excited quark, and di-boson channels ($\gamma\gamma, \gamma Z, WW, ZZ, \gamma g$) to obtain bounds on the EFT parameters. In a final step, we interpret these bounds in terms of constraints on composite models and identify additional final states which promise a high discovery  / exclusion reach for the new resonances.