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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 β†’2β’π‘Ž β†’4⁒𝑏, second to a pair of s...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Nandi, Abhirikshma (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 17 October, 2025
In: Physical review
Year: 2025, Volume: 112, Issue: 7, Pages: 1-44
ISSN:2470-0029
DOI:10.1103/mzld-ldlt
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/mzld-ldlt
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/mzld-ldlt
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Author Notes:G. Aad et al. (ATLAS Collaboration*)
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Summary: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 β†’2β’π‘Ž β†’4⁒𝑏, second to a pair of scalars with different masses (π‘šπ‘Žβ’1 <π‘šπ‘Žβ’2), either directly, 𝐻 β†’π‘Ž1β’π‘Ž2 β†’4⁒𝑏, or via a longer decay chain, 𝐻 β†’π‘Ž1β’π‘Ž2 β†’3β’π‘Ž1 β†’6⁒𝑏. The analysis uses proton-proton collision data at βˆšπ‘  =13 TeV collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fbβˆ’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→2β’π‘Žβ†’4⁒𝑏), between 24% and 38% for 𝜎⁑(𝑍⁒𝐻)/𝜎SM⁑(𝑍⁒𝐻)×ℬ⁑(π»β†’π‘Ž1β’π‘Ž2β†’4⁒𝑏), and between 10% and 20% for 𝜎⁑(𝑍⁒𝐻)/𝜎SM⁑(𝑍⁒𝐻)×ℬ⁑(π»β†’π‘Ž1β’π‘Ž2β†’3β’π‘Ž1β†’6⁒𝑏), depending on the masses of the scalar particles.
Item Description: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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Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/mzld-ldlt

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