Probing the CP nature of the Higgs coupling in tt¯h events at the LHC

2017/04/11 by SP Amor Dos Santos, S. Amor dos Santos, M. C. N. Fiolhais +16 · 1 citation
Mathematics · Physics and Astronomy · #Coupling (piping) #Geometry #Higgs boson #High-Energy Particle Collisions Research #Lepton #Mathematics #Nuclear physics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quark #Scalar (mathematics) #hep-ph

paper · pdf · doi:10.1103/physrevd.96.013004

published as Phys. Rev. D 96, 013004 (2017) · 19 pages, 15 figures

arxiv created 2017/04/11 · openalex created_date 2017/04/28 · openalex publication_date 2017/07/17 · arxiv updated 2017/07/21 · openalex updated_date 2026/08/05

Abstract

The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tth events produced in √(s)=13 TeV proton-proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays t\ensuremath→bW⁺\ensuremath→b\ensuremathℓ⁺\ensuremathν_\ensuremathℓ, t\ensuremath→bW^\ensuremath-\ensuremath→b\ensuremathℓ^\ensuremath-\ensuremathν_\ensuremathℓ, and h\ensuremath→bb. Pure scalar (h=H), pure pseudoscalar (h=A), and CP-violating Higgs boson signal events, generated with MadGraph5_aMC@NLO, are fully reconstructed through a kinematic fit. We furthermore generate samples that have both a CP-even and a CP-odd component in the tth coupling in order to probe the ratio of the two components. New angular distributions of the decay products, as well as CP angular asymmetries, are explored in order to separate the scalar from the pseudoscalar components of the Higgs boson and reduce the contribution from the dominant irreducible background, ttbb. Significant differences between the angular distributions and asymmetries are observed, even after the full kinematic fit reconstruction of the events, allowing to define the best observables for a global fit of the Higgs couplings parameters.

Citations

• Next-to-next-to-leading logarithm resummation fors-channel single top quark production
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• Evidence for the spin-0 nature of the Higgs boson using ATLAS data
• Constraints on the spin-parity and anomalousHVVcouplings of the Higgs boson in proton collisions at 7 and 8 TeV
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• pp¯→tt¯H: A Discovery Mode for the Higgs Boson at the Fermilab Tevatron
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Higgs radiation off bottom quarks at the Fermilab Tevatron and the CERN LHC

Cited by

• Probing the CP nature of the Higgs coupling in tth events at the LHC

Related

• Probing the CP nature of the Higgs coupling in tth events at the LHC
• Measuring the CP structure of the top Yukawa coupling in ttH events at the LHC
• ttH Interactions and T-odd Correlations at Hadron Colliders
• \mathrmttH/tH production at CMS
• Enhancing tthh production through CP-violating top-Higgs interaction at the LHC, ILC and a 100 TeV collider