Z and Higgs Factory Implications of Two Higgs Doublets with First-Order Phase Transitions

Abstract

We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their compatibility with projected precision electroweak and Higgs measurements, as well as searches for exotic Higgs bosons. We show that radiative corrections to $e^{+}{e}^{-}\to hZ$ production introduce deviations in the cross section that are resolvable with the anticipated sub-percent precision at lepton colliders even when experimental outcomes of the LHC and $Z$ pole measurements are in agreement with the SM. This underscores the opportunities of a precision lepton collider to explore BSM quantum corrections to the Higgs sector more broadly.

References in corpus (25)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The oblique parameters in multi-Higgs-doublet models
• Pinch Technique: Theory and Applications
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• Cosmological phase transitions: from perturbative particle physics to gravitational waves
• Basis-independent methods for the two-Higgs-doublet model III: The CP-conserving limit, custodial symmetry, and the oblique parameters S, T, U
• Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
• HiggsTools: BSM scalar phenomenology with new versions of HiggsBounds and HiggsSignals
• CEPC Technical Design Report -- Accelerator (v2)
• Echoes of the Electroweak Phase Transition: Discovering a second Higgs doublet through $A_0\to H_{0}Z$
• The Higgs Vacuum Uplifted: Revisiting the Electroweak Phase Transition with a Second Higgs Doublet
• Gauge-independent $\overline{MS}$ renormalization in the 2HDM
• Probing extended Higgs sectors by the synergy between direct searches at the LHC and precision tests at future lepton colliders
• Observation of a pseudoscalar excess at the top quark pair production threshold
• Gauge-independent Renormalization of the N2HDM
• The Flavourful Present and Future of 2HDMs at the Collider Energy Frontier
• First shot of the smoking gun: probing the electroweak phase transition in the 2HDM with novel searches for $A\to ZH$ in ${\ell }^{+}{\ell }^{-}t\bar{t}$ and $\nu \nu b\bar{b}$ final states
• Impact of NLO Weak SMEFT Corrections in $e^{+}{e}^{-}\to ZH$
• One-loop radiative corrections to $e^{+}{e}^{-}\to Z{h}^0/H^0{A}^0$ in the Inert Higgs Doublet Model
• Dispelling the $\sqrt{L}$ myth for the High-Luminosity LHC
• Electroweak renormalization based on gauge-invariant vacuum expectation values of non-linear Higgs representations: 1. Standard Model
• On the BSM reach of four top production at the LHC
• Resonant top pair searches at the LHC: a window to electroweak phase transition
• A special Higgs challenge: Measuring the mass and production cross section with ultimate precision at FCC-ee
• Electroweak renormalization based on gauge-invariant vacuum expectation values of non-linear Higgs representations: 2. extended Higgs sectors

Cited by in corpus (1)

• Chasing the two-Higgs-doublet model via electroweak corrections at $e^{+}{e}^{-}$ colliders