Long-lived charged Higgs at LHC as a probe of scalar Dark Matter

Abstract

We study inert charged Higgs boson $H^{\pm }$ production and decays at LHC experiments in the context of constrained scalar dark matter model (CSDMM). In the CSDMM the inert doublet and singlet scalar's mass spectrum is predicted from the GUT scale initial conditions via RGE evolution. We compute the cross sections of processes $pp\to H^{+}{H}^{-},H^{\pm }{S}_i^0$ at the LHC and show that for light $H^{\pm }$ the first one is dominated by top quark mediated 1-loop diagram with Higgs boson in s-channel. In a significant fraction of the parameter space $H^{\pm }$ are long-lived because their decays to predominantly singlet scalar dark matter (DM) and next-to-lightest (NL) scalar, $H^{\pm }\to S_{\text{DM, NL}}f{f}^{\prime },$ are suppressed by the small singlet-doublet mixing angle and by the moderate mass difference $\Delta M=M_{H^{+}}-M_{\text{DM}}.$ The experimentally measurable displaced vertex in $H^{\pm }$ decays to leptons and/or jets and missing energy allows one to discover the $H^{+}{H}^{-}$ signal over the huge $W^{+}{W}^{-}$ background. We propose benchmark points for studies of this scenario at the LHC. If, however, $H^{\pm }$ are short-lived, the subsequent decays $S_{\text{NL}}\to S_{\text{DM}}f\bar{f}$ necessarily produce additional displaced vertices that allow to reconstruct the full $H^{\pm }$ decay chain.

15 pages, 5 figures

References in corpus (4)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• micrOMEGAs2.0: a program to calculate the relic density of dark matter in a generic model
• Electroweak Symmetry Breaking induced by Dark Matter
• EWSB from the soft portal into Dark Matter and prediction for direct detection

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• Phenomenology of charged scalars in the CP-Violating Inert-Doublet Model
• Searching for an elusive charged Higgs at the Large Hadron Collider
• Simple Standard Model Extension by Heavy Charged Scalar