Resonant top pair searches at the LHC: a window to electroweak phase transition

Abstract

The dynamics of electroweak phase transition could have profound consequences for particle physics and cosmology. We study the prospects for the HL-LHC to probe the strong first-order electroweak phase transition (SFOEWPT) regime in the type-I 2HDM. We focus on the Higgstrahlung channel $pp\to ZH/A$ with a resonant top-quark pair final state $H/A\to t\bar{t}$. We find that the top-quark pair final state renders the largest sensitivity to the SFOEWPT regime, in comparison to the other Higgstrahlung searches already performed by ATLAS and CMS, that focus on the $H/A\to bb$ and $H\to WW$ final states. We also derive the complementarity of the Higgstrahlung searches with other relevant classes of searches at the HL-LHC and compare them with the gravitational wave sensitivity at LISA.

25 pages, 9 figures; v2: match to published version

References in corpus (18)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• HiggsSignals-2: Probing new physics with precision Higgs measurements in the LHC 13 TeV era
• Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
• Top pair invariant mass distribution: a window on new physics
• Echoes of the Electroweak Phase Transition: Discovering a second Higgs doublet through $A_0\to H_{0}Z$
• On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet model
• Top Quark Pairs at High Invariant Mass - A Model-Independent Discriminator of New Physics at the LHC
• The Higgs Vacuum Uplifted: Revisiting the Electroweak Phase Transition with a Second Higgs Doublet
• Search for heavy Higgs bosons $A/H$ decaying to a top quark pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• New Insights of Electroweak Phase Transition in NMSSM
• Impact of Vacuum Stability Constraints on the Phenomenology of Supersymmetric Models
• Challenges and opportunities for heavy scalar searches in the $t\bar{t}$ channel at the LHC
• Electroweak baryogenesis in aligned two Higgs doublet models
• Interference Effects in $t\bar{t}$ Production at the LHC as a Window on New Physics
• The Flavourful Present and Future of 2HDMs at the Collider Energy Frontier
• Bump-hunting in LHC ttbar events

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• Prospecting bipartite Dark Matter through Gravitational Waves
• Higgs interference effects in top-quark pair production in the 1HSM
• Gravitational wave signatures of first-order phase transition in two-component dark matter model
• Benchmarking a fading window: electroweak baryogenesis in the C2HDM, LHC constraints after Run 2 and prospects for LISA
• Top-quark spin correlations as a tool to distinguish pseudoscalar $A\to ZH$ and scalar $H\to ZA$ signatures in $Zt\bar{t}$ final states at the LHC
• Z and Higgs Factory Implications of Two Higgs Doublets with First-Order Phase Transitions
• Constraining $A\to ZH$ with $H\to t\bar{t}$ in the Low-Mass Region