Electroweak baryogenesis via bottom transport: complementarity between LHC and future lepton collider probes

Tanmoy Modak; Eibun Senaha

doi:10.1016/j.physletb.2021.136695

paper

Electroweak baryogenesis via bottom transport: complementarity between LHC and future lepton collider probes

arXiv:2107.12789 · doi:10.1016/j.physletb.2021.136695

Abstract

We study the complementarity between the Large Hadron Collider (LHC) and future lepton colliders in probing electroweak baryogenesis induced by an additional bottom Yukawa coupling $ρ_{bb}$ . The context is general two Higgs doublet model (g2HDM) where such additional bottom Yukawa coupling can account for the observed baryon asymmetry of the Universe if $\mbox{Im}(ρ_{bb}) \gtrsim 0.058$. We find that LHC would probe the nominal $\mbox{Im}(ρ_{bb})$ required for baryogenesis to some extent via $b g \to b A \to b Z h$ process if $300~\mbox{GeV}\lesssim m_A \lesssim 450$ GeV, where $A$ is the CP-odd scalar in g2HDM. We show that future electron positron collider such as International Linear Collider with $500$ GeV and 1 TeV collision energies may offer unique probe for the nominal $\mbox{Im}(ρ_{bb})$ via $e^{+} e^{-} \to Z^{*} \to A H$ process followed by $A, H \to b b ˉ$ decays in four $b$ -jets signature. For complementarity we also study the resonant diHiggs productions, which may give an insight into strong first-order electroweak phase transition, via $e^{+} e^{-} \to Z^{*} \to A H \to A hh$ process in six $b$ -jets signature. We find that 1 TeV collision energy with $O (1) ab^{- 1}$ integrated luminosity could offer an ideal environment for the discovery.

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