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

S. Amor dos Santos, M. C. N. Fiolhais, R. Frederix, R. Gonçalo, E. Gouveia, R. Martins, A. Onofre, C. M. Pease, H. Peixoto, A. Reigoto, R. Santos, and J. Silva
Phys. Rev. D 96, 013004 – Published 17 July 2017

Abstract

The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tt¯h events produced in s=13TeV proton-proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays tbW+b+ν, t¯b¯Wb¯ν¯, and hbb¯. 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 tt¯h 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, tt¯bb¯. 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.

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  • Received 13 April 2017

DOI:https://doi.org/10.1103/PhysRevD.96.013004

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

S. Amor dos Santos1, M. C. N. Fiolhais1,2, R. Frederix3, R. Gonçalo4, E. Gouveia5, R. Martins5, A. Onofre5, C. M. Pease5, H. Peixoto6, A. Reigoto5, R. Santos5,7,8, and J. Silva6

  • 1LIP, Departamento de Física, Universidade de Coimbra, 3004-516 Coimbra, Portugal
  • 2Department of Science, Borough of Manhattan Community College, City University of New York, 199 Chambers St, New York, New York 10007, USA
  • 3Physik Department T31, Technische Universität München, James-Franck-Str. 1, D-85748 Garching, Germany
  • 4LIP, Av. Elias Garcia, 14-1, 1000-149 Lisboa, Portugal
  • 5LIP, Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal
  • 6Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
  • 7Instituto Superior de Engenharia de Lisboa—ISEL, 1959-007 Lisboa, Portugal
  • 8Centro de Física Teórica e Computacional, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Edifício C8 1749-016 Lisboa, Portugal

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Vol. 96, Iss. 1 — 1 July 2017

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