2017/01/31 by Jinmian Li, Zong-Guo Si, Zong-guo Si +2 · 1 citation
Physics and Astronomy · #Asymmetry #CP violation #Coupling (piping) #Geometry #Hierarchy problem #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Standard Model (mathematical formulation) #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2018.02.009
minor changes, version accepted by PLB
openalex created_date 2017/01/26 · arxiv created 2018/02/04 · openalex publication_date 2018/02/09 · arxiv updated 2018/02/14 · openalex updated_date 2026/08/05
The Higgs-top coupling plays a central role in the hierarchy problem and the vacuum stability of the Standard Model (SM). We propose a central-edge asymmetry (ACE) to probe the CP violating Higgs-top coupling in dileptonic channel of tt¯h(→bb¯) production at the LHC. We demonstrate that the CP-violating Higgs-top coupling can affect the central-edge asymmetry through distorting Δyℓ+ℓ− distribution because of the contribution of new top charge asymmetric term. Since Δyℓ+ℓ− distribution is frame-independent and has a good discrimination even in boosted regime, we use the jet substructure technique to enhance the observability of the dileptonic channel of tt¯h production. We find that (1) the significance of dileptonic channel of tt¯h production can reach 5σ for CP phase ξ=0,π/4,π/2 when the luminosity L=795,993,1276fb−1 at 14 TeV LHC. (2) the central-edge asymmetry ACE show a good discrimination power of CP phase of tt¯h interaction, which are −40.26%, −26.60%, −9.47% for ξ=0, π/4, π/2 respectively and are hardly affected by the event selections. Besides, by performing the binned-χ2 analysis of Δyℓ+ℓ− distribution, we find that the scalar and pseudo-scalar interactions can be distinguished at 95% C.L. level at 14 TeV HL-LHC.