SEZIONE DI ROMA III
The Yukawa coupling of the Higgs boson to the top quark is one of the fundamental parameters of the Standard Model, and its size probes whether the electroweak symmetry breaking mechanism and the fermion mass generation mechanism are the same. Indirect measurements of this quantity – determined from Higgs production via top quark loops – are available, but suffer from ambiguity with possible new physics in the loop diagrams. In contrast we can constrain the Yukawa coupling with tree diagrams using the cross-section of associated production of the Higgs boson with a top quark pair (ttH). I will discuss the latest ATLAS searches for ttH production in the H →γγ, H→bb, H→WW, and H→ττ decays and some projections for the future.

DATA: 10-06-2015