Phenomenology of additional scalar bosons at the LHC

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 $\chi$ and $S$ have been introduced in the THDM where $\chi$ is treated as a candidate for dark matter. $\chi$ does not receive any vacuum expectation value ($vev$) in the model whereas the Higgs-like scalar $S$ acquires $vev$. This allows small mixing between the $CP$-even scalars of the THDM, $h$, $H$ and $S$. In this study the mass spectrum of new scalars is taken to be $2m_h<m_H<2m_t$, $m_{\chi }<m_h/2$, $m_h\lesssim m_S\lesssim m_H-m_h$, $m_A>2m_t$ 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 $CP$-even scalar $H$, $CP$-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 .

arXiv comment5 pages, 2 tables, submitted to SAIP 2016, South Africa proceedings

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• Search for a high-mass Higgs boson decaying to a $W$ boson pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
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• Fiducial and differential cross sections of Higgs boson production measured in the four-lepton decay channel in $pp$ collisions at $\sqrt{s}$=8 TeV with the ATLAS detector
• Searches for a heavy scalar boson H decaying to a pair of 125 GeV Higgs bosons hh or for a heavy pseudoscalar boson A decaying to Zh, in the final states with h to tau tau
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• Measurement of differential cross sections for Higgs boson production in the diphoton decay channel in pp collisions at sqrt(s) = 8 TeV
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