Angular distributions in t t ¯ H (H →b b ¯) reconstructed events at the LHC

Summary, in English

The associated production of a Higgs boson and a top-quark pair, tt¯H, 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 tt¯H events with two oppositely charged leptons and four jets from the decays t→bW+→b+ν, t¯→b¯W-→b¯-ν¯ and h→bb¯, 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 tt¯H signal events over the dominant irreducible background contribution, tt¯bb¯. Even after the full kinematic fit reconstruction of the events, the proposed angular distributions and asymmetries are still quite different in the tt¯H signal and the dominant background (tt¯bb¯).

• Author: S. P. Amor Dos Santos; J. P. Araque; R. Cantrill; N. F. Castro; M. C.N. Fiolhais; R. Frederix; R. Gonçalo; R. Martins; R. Santos; J. Silva; A. Onofre; H. Peixoto; A. Reigoto
• Publishing year: 2015-08-26
• Language: English
• Publication/Series: Physical Review D - Particles, Fields, Gravitation and Cosmology
• Volume: 92
• Issue: 3
• Links: http://dx.doi.org/10.1103/PhysRevD.92.034021
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1550-7998