Angular distributions in t(t)over-barH(H -> b(b)over-bar) reconstructed events at the LHC

• Autor(a) principal: Santos, S. P. Amor dos
• Data de Publicação: 2015
• Outros Autores: Araque, J. P., Cantrill, R., Castro, N. F., Fiolhais, M. C. N., Frederix, R., Gonçalo, R., Martins, R., Santos, R., Silva, J., Onofre, A., Peixoto, H., Reigoto, A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.21/5866
• topic: Model HIGGS-BOSON; Atlas detector; Top quarks; Massless particles; Broken symmetries; Madanalysis 5; Association; Search; Collisions; NLO

The associated production of a Higgs boson and a top-quark pair, t (t) over barH, in proton-proton collisions is addressed in this paper for a center of mass energy of 13 TeV at the LHC. Dileptonic final states of t (t) over barH events with two oppositely charged leptons and four jets from the decays t -> bW(+) -> bl(+)v(l), (t) over bar -> (b) over barW(-) -> (b) over barl(-)(v) over bar (l) and h -> b (b) over bar are used. Signal events, generated with MadGraph5_aMC@NLO, are fully reconstructed by applying a kinematic fit. New angular distributions of the decay products as well as angular asymmetries are explored in order to improve discrimination of t (t) over barH signal events over the dominant irreducible background contribution, t (t) over barb (b) over bar. Even after the full kinematic fit reconstruction of the events, the proposed angular distributions and asymmetries are still quite different in the t (t) over barH signal and the dominant background (t (t) over barb (b) over bar).