Search for pseudoscalar Higgs boson $A_0$ of the Bestest Little Higgs model at the LHC and FCC-hh

Abstract

We analyse the sensitivity of the Large Hadron Collider (LHC) and the Future Circular Collider-hadron-hadron (FCC-hh) to the existence of pseudoscalar Higgs boson $A_0$ predicted by the Bestest Little Higgs model. We study the tree-level (two and three body) and one-loop decays of the pseudoscalar, $A_0\to b\bar{b},t\bar{t},\gamma t\bar{t},\gamma b\bar{b},Zt\bar{t},Zb\bar{b},Wt\bar{b},h_{0}t\bar{t},h_{0}b\bar{b}$, and $A_0\to \gamma \gamma ,\gamma Z,ZZ,gg,WW$, respectively. In addition, we perform a phenomenological study of the production of the pseudoscalar $A_0$ via gluon fusion $gg\to A_0\to Y$ processes, where $Y\equiv \gamma \gamma ,\gamma Z,ZZ,gg,WW$. From the cross section of the processes of interest and the expected integrated luminosity of the LHC and FCC-hh, we determined the number of events that could be produced in both colliders.

23 pages, 7 figures