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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
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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

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
The journal of high energy physics, 卷.2026(5), 頁.183
15/05/2026
Web of Science ID: WOS:001799409400001

摘要

Classical and Quantum Gravitation Elementary Particles Physics Physics and Astronomy Quantum Field Theories Quantum Field Theory Quantum Physics Regular Article - Experimental Physics Relativity Theory String Theory
A bstract A measurement of the associated production of a top-quark pair with the Higgs boson ( t t ¯ H ) in multilepton final states is presented. The analysis is based on a data sample of proton-proton collisions at 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 ¯ H signal and constrain the most relevant backgrounds. The measured t t ¯ H cross-section normalised to Standard Model (SM) prediction is σ t t ¯ H / σ SM = 0 . 63 − 0.19 + 0.20 . This result corresponds to an observed (expected) significance of 3.3 σ (5.3 σ ). Additionally, two other fits are used to measure the t t ¯ H 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 ¯ H one. The CP structure of the top quark-Higgs boson Yukawa coupling is probed through an analysis of t t ¯ H 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 | α | > 62 ° are excluded at 68% confidence level.

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