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Author  |
ATLAS Collaboration (Aad, G. et al); Ahuja, S.; Aikot, A.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Carrion Martinez, C.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gonzalez de la Hoz, S.; Hofer, J.; Jimenez Ortega, M.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Taylor Vara, R.J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vincent, M.; Vos, M.; Wandall-Christensen, K.; Zakareishvili, T. |
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Title |
Measurement of the Higgs boson production in association with top quarks in multilepton final states in pp collisions at √s=13 TeV with the ATLAS detector |
Type |
Journal Article |
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Year |
2026 |
Publication |
Journal of High Energy Physics |
Abbreviated Journal |
J. High Energy Phys. |
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Volume |
05 |
Issue |
5 |
Pages |
183 - 67pp |
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Keywords |
Hadron-Hadron Scattering |
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Abstract |
A measurement of the associated production of a top-quark pair with the Higgs boson (t (t) over barH) in multilepton final states is presented. The analysis is based on a data sample of proton-proton collisions at root s = 13 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 140 fb(-1). Six final states defined by the number and flavour of reconstructed charged leptons are combined in a simultaneous likelihood fit to extract the t (t) over barH signal and constrain the most relevant backgrounds. The measured t (t) over barH cross-section normalised to Standard Model (SM) prediction is sigma(t (t) over barH)/sigma(SM) = 0.63(-0.19)(+0.20). This result corresponds to an observed (expected) significance of 3.3 sigma (5.3 sigma). Additionally, two other fits are used to measure the t (t) over barH cross-section differentially in bins of the Higgs boson transverse momentum in the simplified template cross-section framework, and to extract the associated production cross-section of a single top-quark with the Higgs boson (tH) together with the t (t) over barH one. The CP structure of the top quark-Higgs boson Yukawa coupling is probed through an analysis of t (t) over barH and tH events. The results are compatible with the SM hypothesis, and values of the mixing angle between CP-even and CP-odd top-Higgs Yukawa couplings of vertical bar alpha vertical bar > 62 degrees are excluded at 68% confidence level. |
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Address |
[Desai, A. M.; Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Kull, J.; Pandya, H. D.; Purnell, H. I.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia, Email: atlas.publications@cern.ch |
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Publisher |
Springer |
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Language |
English |
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Notes |
WOS:001799409400001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7315 |
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