Combination of Searches for Higgs Boson Pair Production in 𝑝𝑝 Collisions at √𝑠 = 13 TeV with the ATLAS Detectorr
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(Published version)
Date
2024
Authors
Aad, G.
Aakvaag, E.
Abbott, B.
Abdelhameed, S.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboelela, M.
Aboulhorma, A.
Abramowicz, H.
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Journal article
Citation
Physical Review Letters, 2024; 133(10):101801-1-101801-22
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G. Aad ... et al. (ATLAS Collaboration)
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Abstract
This Letter presents results from a combination of searches for Higgs boson pair production using 126–140 fb⁻¹ of proton-proton collision data at √𝑠 =13 TeV recorded with the ATLAS detector. At 95% confidence level (CL), the upper limit on the production rate is 2.9 times the standard model (SM) prediction, with an expected limit of 2.4 assuming no Higgs boson pair production. Constraints on the Higgs boson self-coupling modifier 𝜅𝜆=𝜆𝐻𝐻𝐻/𝜆SM 𝐻𝐻𝐻, and the quartic 𝐻𝐻𝑉𝑉 coupling modifier 𝜅2𝑉=𝑔𝐻𝐻𝑉𝑉/𝑔SM 𝐻𝐻𝑉𝑉, are derived individually, fixing the other parameter to its SM value. The observed 95% CL intervals are −1.2<𝜅𝜆<7.2 and 0.6<𝜅2𝑉<1.5, respectively, while the expected intervals are −1.6<𝜅𝜆<7.2 and 0.4<𝜅2𝑉<1.6 in the SM case. Constraints obtained for several interaction parameters within Higgs effective field theory are the strongest to date, offering insights into potential deviations from SM predictions.
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Published 4 September 2024
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© 2024 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.