paper

Phenomenology of additional scalar bosons at the LHC

arXiv:1608.03466

Abstract

The confirmation of the Higgs boson in Run I data at the Large Hadron Collider (LHC) and the excesses in recent Run II data suggest scenarios beyond the Standard Model (SM). We pursue a study in a minimal model which is an extension of a scalar doublet in the SM known as two-Higgs doublet model (THDM). Following earlier suggestions two real scalars $I ¨ $ and $S$ have been introduced in the THDM where $I ¨ $ is treated as a candidate for dark matter. $I ¨ $ does not receive any vacuum expectation value ( $v e v$ ) in the model whereas the Higgs-like scalar $S$ acquires $v e v$ . This allows small mixing between the $C P$ -even scalars of the THDM, $h$ , $H$ and $S$ . In this study the mass spectrum of new scalars is taken to be $2 m_{h} < m_{H} < 2 m_{t}$ , $m_{I ¨} < m_{h} /2$ , $m_{h} ≲ m_{S} ≲ m_{H} - m_{h}$ , $m_{A} > 2 m_{t}$ and $m_{H}^{\pm} < m_{A}$ , where $m_{h}$ and $m_{t}$ is masses of the SM Higgs and top-quark respectively, $m_{H}, m_{A}$ and $m_{H^{\pm}}$ are the masses of the heavy $C P$ -even scalar $H$ , $C P$ -odd scalar $A$ , and charged Higgs $H^{\pm}$ , respectively. A partial list of potential search channels at the LHC has been provided with possible phenomenological consequences. The expected phenomenology and constraints on parameters are also discussed in a model-independent approach .

5 pages, 2 tables, submitted to SAIP 2016, South Africa proceedings