Amor dos Santos, S. P.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.2019-02-042019-02-042015-08-26http://dx.doi.org/10.1103/PhysRevD.92.034021http://hdl.handle.net/10400.26/26811The associated production of a Higgs boson and a top-quark pair, $t{\bar t} H$, in proton-proton collisions is addressed in this paper for a center of mass energy of 13TeV at the LHC. Dileptonic final states of $t{\bar t}H$ events with two oppositely charged leptons and four jets from the decays $t\rightarrow bW^+ \rightarrow b \ell^+\nu_\ell$, $\bar{t}\rightarrow \bar{b}W^- \rightarrow \bar{b} \ell^-\bar{\nu}_\ell$ and $h\rightarrow b\bar{b}$, 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 $t{\bar t} H$ signal events over the dominant irreducible background contribution, $t{\bar t}b{\bar b}$. Even after the full kinematic fit reconstruction of the events, the proposed angular distributions and asymmetries are still quite different in the $t\bar{t}H$ signal and the dominant background ($t\bar{t}b\bar{b}$).engjournal article2019-02-04