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.
Highlights
The LHC has entered a phase with exceptional potential for discovering new physics, and new data is being collected at an unprecedented rate during the Run-II that started last year
The models discussed in this work are four dimensional gauge theories combining the concept of the Higgs as a pseudo-Nambu-Goldstone boson [1] with that of partial compositeness [2], where the top quark mass arises by a linear coupling with a spin-1/2 “top-partner”
Once the gauge theory and the top partner operators are specified, the couplings of the singlets and octet can be calculated: as an example, we provide the numerical values in table 8, where the couplings of the singlets are provided for a mixing angle α = ζ and α = ζ/2
Summary
The LHC has entered a phase with exceptional potential for discovering new physics, and new data is being collected at an unprecedented rate during the Run-II that started last year. We will focus on the two singlets and on the color octet, commonly present in all models Their couplings to the SM gauge bosons are generated via the Wess-Zumino-Witten [28, 29] anomalous term, and are computable in terms of the properties of the underlying theory. The scalar singlet production via gluon fusion and its subsequent decay to a pair of gauge bosons, both mediated by the WZW interactions, leads to clean signatures at the LHC Such final states are intensely searched for at the LHC, and recently the emergence of excesses in both di-boson and di-photon, less prominent or entirely disappeared, was the source of big excitement and inspiration in the particle physics community.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
