Search for nonresonant pair production of Higgs bosons in the bb¯bb¯ final state in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Collaboration

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Abstract

A search for nonresonant Higgs boson pair production in the 𝑏𝑏⁢¯𝑏⁢𝑏⁢¯ final state is presented. The analysis uses 126  fb−1 of 𝑝⁢𝑝 collision data at √𝑠 =13  TeV collected with the ATLAS detector at the Large Hadron Collider, and targets both the gluon-gluon fusion and vector-boson fusion production modes. No evidence of the signal is found and the observed (expected) upper limit on the cross section for nonresonant Higgs boson pair production is determined to be 5.4 (8.1) times the Standard Model predicted cross section at 95% confidence level. Constraints are placed on modifiers to the 𝐻⁡𝐻⁡𝐻 and 𝐻⁡𝐻⁡𝑉⁢𝑉 couplings. The observed (expected) 2⁢𝜎 constraints on the 𝐻⁡𝐻⁡𝐻 coupling modifier, 𝜅𝜆, are determined to be [−3.5,11.3] ([−5.4,11.4]), while the corresponding constraints for the 𝐻⁡𝐻⁡𝑉⁢𝑉 coupling modifier, 𝜅2⁢𝑉, are [−0.0,2.1] ([−0.1,2.1]). In addition, constraints on relevant coefficients are derived in the context of the Standard Model effective field theory and Higgs effective field theory, and upper limits on the 𝐻⁡𝐻 production cross section are placed in seven Higgs effective field theory benchmark scenarios.
Original languageEnglish
Article number052003
Pages (from-to)052003-1-052003-38
Number of pages38
JournalPhysical Review D
Volume108
Issue number5
DOIs
Publication statusPublished - 1 Sept 2023
Externally publishedYes

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