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Search for decays of the Higgs boson into scalar particles decaying into four or six b quarks using pp collisions at √s=13 TeV with the ATLAS detector

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A search for exotic decays of the Higgs boson 𝐻 into new scalar or pseudoscalar particles that subsequently decay into 𝑏-quarks is presented. The search considers 𝑍⁢𝐻 production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, 𝐻 →2⁢𝑎 →4⁢𝑏, second to a pair of s...

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Hauptverfasser: Aad, Georges (VerfasserIn) , Ackermann, Anke (VerfasserIn) , Backes, Mathias (VerfasserIn) , Baltes, Lisa Marie (VerfasserIn) , Bartels, Falk (VerfasserIn) , Dittmeier, Sebastian (VerfasserIn) , Dunford, Monica (VerfasserIn) , Franchino, Silvia (VerfasserIn) , Junkermann, Thomas (VerfasserIn) , Mkrtchyan, Tigran (VerfasserIn) , Nandi, Abhirikshma (VerfasserIn) , Rassloff, Damir Fabrice (VerfasserIn) , Sanfilippo, Lorenzo (VerfasserIn) , Schöning, André (VerfasserIn) , Schultz-Coulon, Hans-Christian (VerfasserIn) , Sothilingam, Varsiha (VerfasserIn) , Vigani, Luigi (VerfasserIn) , Wessels, Martin (VerfasserIn) , Zinßer, Joachim (VerfasserIn)
Körperschaft: ATLAS Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 October, 2025
In: Physical review
Year: 2025, Jahrgang: 112, Heft: 7, Pages: 1-44
ISSN:2470-0029
DOI:10.1103/mzld-ldlt
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/mzld-ldlt
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/mzld-ldlt
Volltext
Verfasserangaben:G. Aad et al. (ATLAS Collaboration*)
Beschreibung
Zusammenfassung:A search for exotic decays of the Higgs boson 𝐻 into new scalar or pseudoscalar particles that subsequently decay into 𝑏-quarks is presented. The search considers 𝑍⁢𝐻 production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, 𝐻 →2⁢𝑎 →4⁢𝑏, second to a pair of scalars with different masses (𝑚𝑎⁢1 <𝑚𝑎⁢2), either directly, 𝐻 →𝑎1⁢𝑎2 →4⁢𝑏, or via a longer decay chain, 𝐻 →𝑎1⁢𝑎2 →3⁢𝑎1 →6⁢𝑏. The analysis uses proton-proton collision data at √𝑠 =13 TeV collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross section to the SM prediction times the branching ratio of Higgs bosons decaying into 4⁢𝑏 or 6⁢𝑏, between 4% and 25% for 𝜎⁡(𝑍⁢𝐻)/𝜎SM⁡(𝑍⁢𝐻)×ℬ⁡(𝐻→2⁢𝑎→4⁢𝑏), between 24% and 38% for 𝜎⁡(𝑍⁢𝐻)/𝜎SM⁡(𝑍⁢𝐻)×ℬ⁡(𝐻→𝑎1⁢𝑎2→4⁢𝑏), and between 10% and 20% for 𝜎⁡(𝑍⁢𝐻)/𝜎SM⁡(𝑍⁢𝐻)×ℬ⁡(𝐻→𝑎1⁢𝑎2→3⁢𝑎1→6⁢𝑏), depending on the masses of the scalar particles.
Beschreibung:Veröffentlicht: 17. Oktober 2025
*ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, A. Nandi, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, L. Vigani, M. Wessels, J. Zinsser [und 2896 weitere Personen]
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Im Titel steht der Buchstabe "s" unter dem Wurzelsymbol
Beschreibung:Online Resource
ISSN:2470-0029
DOI:10.1103/mzld-ldlt

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