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

ATLAS Collaboration

doi:10.1016/j.physletb.2025.139277

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

ATLAS Collaboration

Physics and Astronomy

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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 off-shell 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% confidence 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).

Original language	English
Article number	139277
Number of pages	21
Journal	Physics Letters B
Volume	861
Early online date	20 Jan 2025
DOIs	https://doi.org/10.1016/j.physletb.2025.139277
Publication status	Published - Feb 2025

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@article{9279c59b40a94ebeb01f4496fbd0b6db,

title = "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",

abstract = "This Letter presents a constraint on the total width of the Higgs boson (ΓH) using a combined measurement of on-shell Higgs boson production and the production of four top quarks, which involves contributions from off-shell 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\% confidence level upper limit on ΓH 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).",

author = "\{ATLAS Collaboration\} and P.P. Allport and P. Bellos and J. Bracinik and D.G. Charlton and A.S. Chisholm and A. Dimitrievska and L. Gonella and C.M. Hawkes and S.J. Hillier and K. Krizka and E.H.L. Liu and J.D. Lomas and T.J. Neep and P.R. Newman and K. Nikolopoulos and E. Skorda and J.P. Thomas and P.D. Thompson and A.T. Watson and M.F. Watson",

year = "2025",

month = feb,

doi = "10.1016/j.physletb.2025.139277",

language = "English",

volume = "861",

journal = "Physics Letters B",

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T1 - 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

AU - ATLAS Collaboration

AU - Allport, P.P.

AU - Bellos, P.

AU - Bracinik, J.

AU - Charlton, D.G.

AU - Chisholm, A.S.

AU - Dimitrievska, A.

AU - Gonella, L.

AU - Hawkes, C.M.

AU - Hillier, S.J.

AU - Krizka, K.

AU - Liu, E.H.L.

AU - Lomas, J.D.

AU - Neep, T.J.

AU - Newman, P.R.

AU - Nikolopoulos, K.

AU - Skorda, E.

AU - Thomas, J.P.

AU - Thompson, P.D.

AU - Watson, A.T.

AU - Watson, M.F.

PY - 2025/2

Y1 - 2025/2

N2 - This Letter presents a constraint on the total width of the Higgs boson (ΓH) using a combined measurement of on-shell Higgs boson production and the production of four top quarks, which involves contributions from off-shell 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% confidence level upper limit on ΓH 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).

AB - This Letter presents a constraint on the total width of the Higgs boson (ΓH) using a combined measurement of on-shell Higgs boson production and the production of four top quarks, which involves contributions from off-shell 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% confidence level upper limit on ΓH 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).

U2 - 10.1016/j.physletb.2025.139277

DO - 10.1016/j.physletb.2025.139277

M3 - Letter

SN - 0370-2693

VL - 861

JO - Physics Letters B

JF - Physics Letters B

M1 - 139277

ER -

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

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