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Search for Higgs boson pair production in association with top-quark pairs using 196 fb−1 of proton–proton collision data at s=13 and 13.6 TeV with the ATLAS detector
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Search for Higgs boson pair production in association with top-quark pairs using 196 fb−1 of proton–proton collision data at s=13 and 13.6 TeV with the ATLAS detector

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
The journal of high energy physics, 卷.2026(8), 頁.20
03/08/2026
DOI: https://doi.org/10.1007/JHEP08(2026)020

摘要

Classical and Quantum Gravitation Elementary Particles Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Experimental Physics Relativity Theory String Theory
A bstract This paper presents the first search for non-resonant Higgs boson pair production in association with a top-quark pair ( t t ¯ HH ) using proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The data sample corresponds to an integrated luminosity of 196 fb − 1 , comprising 140 fb − 1 at a centre-of-mass energy of s = 13 TeV and 56 fb − 1 at 13.6 TeV. The search targets three distinct final states expected from t t ¯ HH decays: (i) one lepton (electron or muon) with at least five b -quarks, (ii) at least two b -quarks accompanied by two leptons with the same electric charges or multiple leptons, and (iii) at least three b -quarks with two photons. The t t ¯ HH production cross-section, relative to its Standard Model prediction, is measured to be μ t t ¯ HH = − 3 − 12 + 11 . This result corresponds to a 95% confidence-level upper limit of 20 times the Standard Model prediction for the t t ¯ HH production cross-section, with an expected limit of 21. The Higgs effective field theory Wilson coefficient c t t ¯ HH is also constrained at the same confidence level to the range of − 3.9 < c t t ¯ HH < 3.3 , compared with the expected range of − 4.0 < c t t ¯ HH < 3.5 .

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