Measurement of the top-quark Yukawa coupling from t t ¯ production in the lepton+jets final state using pp collisions at s = 13 TeV with the ATLAS detector
The top-quark Yukawa coupling is extracted from the distribution of the top-quark pair ( t t ¯ ) invariant mass in proton-proton collisions using 140 fb−1 of data at s = 13 TeV collected in 2015–2018 by the ATLAS experiment at the Large Hadron Collider. In the region near the production threshold, t...
| Autores: | ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; |
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| Tipo de documento: | Artículo |
| Estado: | Published version |
| Fecha de publicación: | 2026 |
| País: | Chile |
| Institución: | Pontificia Universidad Católica de Chile |
| Repositorio: | Pontificia Universidad Católica de Chile |
| OAI Identifier: | oai:repositorio.uc.cl:11534/108135 |
| Acceso en línea: | https://doi.org/10.1007/JHEP01(2026)117 https://repositorio.uc.cl/handle/11534/108135 |
| Nivel de acceso: | Acceso abierto |
| Palabra clave: | 510 Matemática física y química |
| Sumario: | The top-quark Yukawa coupling is extracted from the distribution of the top-quark pair ( t t ¯ ) invariant mass in proton-proton collisions using 140 fb−1 of data at 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 t ¯ 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 t ¯ 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. |
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