Münster 2017 – wissenschaftliches Programm
T 18.6: Vortrag
Montag, 27. März 2017, 18:00–18:15, VSH 05
Heavy Higgs boson production and decay into top quarks at the LHC — Werner Bernreuther1, •Peter Galler2, Clemens Mellein1, Zong-Guo Si3, and Peter Uwer2 — 1Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen University, 52056 Aachen, Germany — 2Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 3School of Physics, Shandong University, Jinan, Shandong 250100, China
We investigate the impact of heavy, neutral Higgs bosons on top-quark pair production at the LHC. For definiteness we consider the type-II two-Higgs-doublet model with two heavy, neutral Higgs bosons with masses larger than twice the top-quark mass. These heavy Higgs bosons can appear as resonances in the tt decay channel. We calculate the resonant production of heavy Higgs bosons and their decay into top-quark pairs including the interference with the standard model (SM) background at next-to-leading order (NLO) QCD. The non-resonant SM contribution to tt production is also taken into account at NLO QCD including weak corrections. Using representative CP-conserving as well as CP-violating parameter scenarios we study different observables and compare their sensitivity to heavy Higgs bosons in the tt channel. In particular, we study spin dependent observables and show that they can enhance the sensitivity significantly.