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First shot of the smoking gun: probing the electroweak phase transition in the 2HDM with novel searches for A → ZH in+tt and ννbb final states

Biekötter, Thomas 1; Heinemeyer, Sven; No, Jose Miguel; Radchenko, Kateryna; Olea Romacho, María Olalla; Weiglein, Georg
1 Institut für Theoretische Physik (ITP), Karlsruher Institut für Technologie (KIT)

Abstract:

Recently the ATLAS collaboration has reported the first results of searches for
heavy scalar resonances decaying into a Z boson and a lighter new scalar resonance, where
the Z boson decays leptonically and the lighter scalar decays into a top-quark pair, giving rise
to +tt final states. This had previously been identified as a smoking-gun signature at the
LHC for a first-order electroweak phase transition (FOEWPT) within the framework of two
Higgs doublet models (2HDMs). In addition, ATLAS also presented new limits where the Z
boson decays into pairs of neutrinos and the lighter scalar resonance into bottom-quark pairs,
giving rise to the ννbb final state. We analyze the impact of these new searches on the 2HDM
parameter space, with emphasis on their capability to probe currently allowed 2HDM regions
featuring a strong FOEWPT. We also study the complementarity of these new searches
with other LHC probes that could target the FOEWPT region of the 2HDM. Remarkably,
the ATLAS search in the +tt final state shows a local 2.85 σ excess (for masses of about
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Zugehörige Institution(en) am KIT Institut für Theoretische Physik (ITP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000167870
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2024
Heft 1
Seiten 107
Vorab online veröffentlicht am 19.01.2024
Nachgewiesen in OpenAlex
Web of Science
Dimensions
Scopus
Globale Ziele für nachhaltige Entwicklung Ziel 3 – Gesundheit und Wohlergehen

Verlagsausgabe §
DOI: 10.5445/IR/1000167870
Veröffentlicht am 30.01.2024
Originalveröffentlichung
DOI: 10.1007/JHEP01(2024)107
Scopus
Zitationen: 5
Web of Science
Zitationen: 6
Dimensions
Zitationen: 7
Seitenaufrufe: 37
seit 02.02.2024
Downloads: 16
seit 07.02.2024
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