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Search for triple Higgs boson production in the 6⁒𝑏 final state using 𝑝⁒𝑝 collisions at βˆšπ‘  =13  TeV with the ATLAS detector

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Article number032006
<mark>Journal publication date</mark>1/02/2025
<mark>Journal</mark>Physical Review D
Issue number3
Volume111
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A search for the production of three Higgs bosons (𝐻⁑𝐻⁑𝐻) in the 𝑏⁒
Β―
𝑏
⁒𝑏⁒
Β―
𝑏
⁒𝑏⁒
Β―
𝑏
final state is presented. The search uses 126  fbβˆ’1 of proton-proton collision data at βˆšπ‘  =13  TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis targets both nonresonant and resonant production of 𝐻⁑𝐻⁑𝐻. The resonant interpretations primarily consider a cascade decay topology of 𝑋 →𝑆⁒𝐻 →𝐻⁑𝐻⁑𝐻 with masses of the new scalars 𝑋 and 𝑆 up to 1.5 and 1 TeV, respectively. In addition to scenarios where 𝑆 is off-shell, the nonresonant interpretation includes a search for Standard Model 𝐻⁑𝐻⁑𝐻 production, with limits on the trilinear and quartic Higgs self-coupling set. No evidence for 𝐻⁑𝐻⁑𝐻 production is observed. An upper limit of 59 fb is set, at the 95% confidence level, on the cross section for Standard Model 𝐻⁑𝐻⁑𝐻 production.