Abstract
This proceeding presents the latest studies on the Yukawa couplings of the Standard Model Higgs boson with 139 fb−1 data collected using the ATLAS detector at a center-of-mass energy of 13 TeV. A first direct probe of CP violation in the top-quark Yukawa coupling using events where the Higgs boson is produced in association with top quarks (tt‾H and tH), and decays into two photons (H → γγ) is discussed. The latest results on the Higgs boson production in association with a W or Z boson (VH) in the H→bb‾ channel are depicted as well. Finally, the searches for Higgs boson decays into two muons (H → μ+μ−) and two electrons (H → e+e−) are presented.
Highlights
Since the discovery of the Higgs boson in 2012 [1, 2], study on its couplings to the fermions (Yukawa couplings), becomes one important sector at the Large Hadron Collider (LHC) experiments
According to the Standard Model (SM), the Yukawa coupling strength is proportional to the mass of the corresponding fermion
From 2015 to 2018, 139 fb−1 of s = 13 TeV proton–proton collision data was recorded by the ATLAS detector [3]
Summary
Since the discovery of the Higgs boson in 2012 [1, 2], study on its couplings to the fermions (Yukawa couplings), becomes one important sector at the Large Hadron Collider (LHC) experiments. From 2015 to 2018, 139 fb−1 of s = 13 TeV proton–proton collision data was recorded by the ATLAS detector [3] Based on this amount of dataset, studies on ttH/tH via H → γγ [4] and H → bbin the V H production mode [5, 6] (third generation), as well as H → μ+μ− [7] (second generation) and H → e+e− [8] (first generation) are performed. The effective field theory used for this study is provided by the Higgs Characterization model [9] Within this model, the term in the effective Lagrangian that describes the top-quark Yukawa coupling is:. The Background Rejection BDT is trained to separate ttH-like events from background which are mainly nonresonant diphoton production processes (γγ+jets and ttγγ). Two analyses are performed: “Resolved Analysis” and “Boosted Analysis”, which are depicted in the following two subsections
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