ACAT 2019

Trilinear Higgs boson coupling variations for di-Higgs production with full NLO QCD predictions in POWHEG

13 Mar 2019, 15:30

20m

Steinmatte Room C

Oral Track 3: Computations in Theoretical Physics: Techniques and Methods Track 3: Computations in Theoretical Physics: Techniques and Methods

Speaker

Ludovic Michel Scyboz (Max-Planck-Institut fur Physik (DE))

Description

While the Higgs boson couplings to other particles are increasingly well-measured by LHC experiments, it has proven difficult to set constraints on the Higgs trilinear self-coupling $\lambda$, principally due to the very low cross-section of Higgs boson pair production. We present the results of NLO QCD corrections to Higgs pair production with full top-quark mass dependence, where the fixed-order computation up to two loops has been performed numerically, using both CPUs and GPUs. It is supplemented by parton showering within the $\mathtt{\text{POWHEG}}$ event generator framework. We use the interface between the $\mathtt{\text{POWHEG-BOX-V2}}$ program and both $\mathtt{\text{Pythia8}}$ and $\mathtt{\text{Herwig7}}$ parton showers to generate differential distributions for various values of the trilinear self-coupling $\lambda$ that are still allowed by the current experimental constraints.

Presentation materials

HH_powheg_scyboz.pdf

Peer reviewing

Paper

Accepted on 25 Sept 2019 by Claude Duhr

heinrich_etal.pdf