Di-boson signatures as Standard Candles for Partial Compositeness

Abstract : Composite Higgs Models are often constructed including fermionic top partners with a mass around the TeV scale, with the top partners playing the role of stabilizing the Higgs potential and enforcing partial compositeness for the top quark. A class of models of this kind can be formulated in terms of fermionic strongly coupled gauge theories. A common feature they all share is the presence of specific additional scalar resonances, namely two neutral singlets and a colored octet, described by a simple effective Lagrangian. We study the phenomenology of these scalars, both in a model independent and model dependent way, including the bounds from all the available searches in the relevant channels with di-boson and di-top final states. We develop a generic framework which can be used to constrain any model containing pseudo-scalar singlets or octets. Using it, we find that such signatures provide strong bounds on the compositeness scale complementary to the traditional EWPT and Higgs couplings deviations. In many cases a relatively light scalar can be on the verge of discovery as a first sign of new physics.
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A. Belyaev, G. Cacciapaglia, H. Cai, G. Ferretti, T. Flacke, et al.. Di-boson signatures as Standard Candles for Partial Compositeness. Journal of High Energy Physics, Springer, 2017, 1701 (1), pp.094. ⟨10.1007/JHEP01(2017)094⟩. ⟨in2p3-01391373⟩

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