Constraint on the total width of the Higgs boson from Higgs boson and four-top-quark measurements in pp collisions at √s = 13 TeV with the ATLAS detector
Date
2025
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
Physics Letters B, 2025; 861:139277-1-139277-21
Statement of Responsibility
The ATLAS Collaboration
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Abstract
This Letter presents a constraint on the total width of the Higgs boson (Γ(𝐻)) using a combined measurement of on-shell Higgs boson production and the production of four top quarks, which involves contributions from offshell Higgs boson-mediated processes. This method relies on the assumption that the tree-level Higgs-top Yukawa coupling strength is the same for on-shell and off-shell Higgs boson production processes, thereby avoiding any assumptions about the relationship between on-shell and off-shell gluon fusion Higgs production rates, which were central to previous measurements. The result is based on up to 140 fb (−1) of proton–proton collisions at a centre-of-mass energy of √𝑠 = 13 TeV collected with the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% cofidence level upper limit on Γ(𝐻) is 450 MeV (75 MeV). Additionally, considering the constraint on the Higgs-top Yukawa coupling from loop-induced Higgs boson production and decay processes further yields an observed (expected) upper limit of 160 MeV (55 MeV).
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Dissertation Note
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Letter
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© 2025 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).