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arXiv · 1907.12522

Dark Matter Signals at the LHC from a 3HDM

Diana Rojas-Ciofalo·Adriana Cordero·Jaime Hernandez-Sanchez·Venus Keus·Stefano Moretti·Dorota Sokolowska
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Abstract

We analyse new signals of Dark Matter (DM) at the Large Hadron Collider (LHC) in a 3-Higgs Doublet Model (3HDM) where only one doublet acquires a Vacuum Expectation Value (VEV), preserving a parity $Z_2$. The other two doublets are inert and do not develop a VEV, leading to a dark scalar sector controlled by $Z_2$, with the lightest CP-even dark scalar $H_1$ being the DM candidate. This leads to the loop induced decay of the next-to-lightest scalar, $H_2\to H_1\bar{f}f$ ($f=u,d,c,s,b,e,\mu,\tau$), mediated by both dark CP-odd and charged scalars. This is a smoking-gun signal of the 3HDM since it is not allowed in the 2HDM with one inert doublet and is expected to be important when $H_2$ and $H_1$ are close in mass. In practice, this signature can be observed in the cascade decay of the SM-like Higgs boson, $h\to H_1H_2\to H_1H_1\bar{f}f$ into two DM particles and di-leptons/di-jets, where $h$ is produced from either gluon-gluon Fusion (ggF) or Vector Boson Fusion (VBF).

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Diana Rojas-Ciofalo, Adriana Cordero, Jaime Hernandez-Sanchez, Venus Keus, Stefano Moretti, Dorota Sokolowska. 2019-07-29. Dark Matter Signals at the LHC from a 3HDM. https://arxiv.org/abs/1907.12522

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