The top-quark Yukawa coupling is extracted from the distribution of the topquark pair (t tbar) invariant mass in proton-proton collisions using 140 fb-1 of data at root s = 13 TeV collected in 2015-2018 by the ATLAS experiment at the Large Hadron Collider. In the region near the production threshold, the t tbar invariant mass spectrum is sensitive to electroweak virtual corrections, including contributions from Higgs boson exchange, thereby providing sensitivity to the top-quark Yukawa coupling. This is the first measurement in ATLAS that aims to obtain this coupling exploiting this approach. The t tbar system is reconstructed in the single-lepton final state, requiring exactly one isolated electron or muon and at least four jets with at least two identified as originating from b-quarks. The measured Yukawa coupling is found to be in good agreement with the Standard Model prediction. An upper limit on the top-quark Yukawa coupling strength of Yt < 2.1 relative to the Standard Model prediction is observed at 95% confidence level, consistent with the expected sensitivity.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the top-quark Yukawa coupling from t tbar production in the lepton+jets final state using pp collisions at root s =13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(1) [10.1007/jhep01(2026)117].

Measurement of the top-quark Yukawa coupling from t tbar production in the lepton+jets final state using pp collisions at root s =13 TeV with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

The top-quark Yukawa coupling is extracted from the distribution of the topquark pair (t tbar) invariant mass in proton-proton collisions using 140 fb-1 of data at root s = 13 TeV collected in 2015-2018 by the ATLAS experiment at the Large Hadron Collider. In the region near the production threshold, the t tbar invariant mass spectrum is sensitive to electroweak virtual corrections, including contributions from Higgs boson exchange, thereby providing sensitivity to the top-quark Yukawa coupling. This is the first measurement in ATLAS that aims to obtain this coupling exploiting this approach. The t tbar system is reconstructed in the single-lepton final state, requiring exactly one isolated electron or muon and at least four jets with at least two identified as originating from b-quarks. The measured Yukawa coupling is found to be in good agreement with the Standard Model prediction. An upper limit on the top-quark Yukawa coupling strength of Yt < 2.1 relative to the Standard Model prediction is observed at 95% confidence level, consistent with the expected sensitivity.
2026
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Rilevanza internazionale
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Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
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Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Measurement of the top-quark Yukawa coupling from t tbar production in the lepton+jets final state using pp collisions at root s =13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(1) [10.1007/jhep01(2026)117].
Null, N; Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Ach...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/450189
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