Author(s): Santos, S. P. Amor dos ; 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.
Date: 2015
Persistent ID: http://hdl.handle.net/10400.21/5866
Origin: Repositório Científico do Instituto Politécnico de Lisboa
Subject(s): 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).
