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

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Standard

Probing the CP nature of the Higgs coupling in tt¯h events at the LHC. / Amor Dos Santos, S P; Fiolhais, M. C.N.; Frederix, R.; Gonçalo, R.; Gouveia, E.; Martins, R.; Onofre, A.; Pease, C. M.; Peixoto, H.; Reigoto, A.; Santos, R.; Silva, J.

I: Physical Review D, Vol. 96, Nr. 1, 013004, 01.07.2017.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Amor Dos Santos, SP, Fiolhais, MCN, Frederix, R, Gonçalo, R, Gouveia, E, Martins, R, Onofre, A, Pease, CM, Peixoto, H, Reigoto, A, Santos, R & Silva, J 2017, 'Probing the CP nature of the Higgs coupling in tt¯h events at the LHC', Physical Review D, vol. 96, nr. 1, 013004. https://doi.org/10.1103/PhysRevD.96.013004

APA

Amor Dos Santos, S. P., Fiolhais, M. C. N., Frederix, R., Gonçalo, R., Gouveia, E., Martins, R., ... Silva, J. (2017). Probing the CP nature of the Higgs coupling in tt¯h events at the LHC. Physical Review D, 96(1), [013004]. https://doi.org/10.1103/PhysRevD.96.013004

CBE

Amor Dos Santos SP, Fiolhais MCN, Frederix R, Gonçalo R, Gouveia E, Martins R, Onofre A, Pease CM, Peixoto H, Reigoto A, Santos R, Silva J. 2017. Probing the CP nature of the Higgs coupling in tt¯h events at the LHC. Physical Review D. 96(1). https://doi.org/10.1103/PhysRevD.96.013004

MLA

Vancouver

Amor Dos Santos SP, Fiolhais MCN, Frederix R, Gonçalo R, Gouveia E, Martins R et al. Probing the CP nature of the Higgs coupling in tt¯h events at the LHC. Physical Review D. 2017 jul 1;96(1). 013004. https://doi.org/10.1103/PhysRevD.96.013004

Author

Amor Dos Santos, S P ; Fiolhais, M. C.N. ; Frederix, R. ; Gonçalo, R. ; Gouveia, E. ; Martins, R. ; Onofre, A. ; Pease, C. M. ; Peixoto, H. ; Reigoto, A. ; Santos, R. ; Silva, J. / Probing the CP nature of the Higgs coupling in tt¯h events at the LHC. I: Physical Review D. 2017 ; Vol. 96, Nr. 1.

RIS

TY - JOUR

T1 - Probing the CP nature of the Higgs coupling in tt¯h events at the LHC

AU - Amor Dos Santos, S P

AU - Fiolhais, M. C.N.

AU - Frederix, R.

AU - Gonçalo, R.

AU - Gouveia, E.

AU - Martins, R.

AU - Onofre, A.

AU - Pease, C. M.

AU - Peixoto, H.

AU - Reigoto, A.

AU - Santos, R.

AU - Silva, J.

PY - 2017/7/1

Y1 - 2017/7/1

N2 - 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=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→bW+→b+ν, t-→b-W-→b--ν-, and h→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 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.

AB - 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=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→bW+→b+ν, t-→b-W-→b--ν-, and h→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 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.

UR - http://www.scopus.com/inward/record.url?scp=85027047714&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.96.013004

DO - 10.1103/PhysRevD.96.013004

M3 - Article

VL - 96

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

T2 - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-2368

IS - 1

M1 - 013004

ER -