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Search for triple Higgs boson production in the 6b final state using pp collisions at √s p = 13 TeV with the ATLAS detector
(American Physical Society (APS), 2025) Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N.J.; Abidi, S.H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abulaiti, Y.; Acharya, B.S.; Ackermann, A.; Adam Bourdarios, C.; Adamczyk, L.; Addepalli, S.V.; Addison, M.J.; Adelman, J.; Adiguzel, A.; Adye, T.; et al.
A search for the production of three Higgs bosons (𝐻⁡𝐻⁡𝐻) in the 𝑏⁢ ¯ 𝑏 ⁢𝑏⁢ ¯ 𝑏 ⁢𝑏⁢ ¯ 𝑏 final state is presented. The search uses 126 fb−1 of proton-proton collision data at √𝑠 =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.