# ACAT 2019

10-15 March 2019
Steinmatte conference center
Europe/Zurich timezone

## 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

#### Steinmatte Room C

Oral 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 $\texttt{POWHEG}$ event generator framework. We use the interface between the $\texttt{POWHEG-BOX-V2}$ program and both $\texttt{Pythia8}$ and $\texttt{Herwig7}$ parton showers to generate differential distributions for various values of the trilinear self-coupling $\lambda$ that are still allowed by the current experimental constraints.

### Primary authors

Gudrun Heinrich (Max Planck Institute for Physics) Matthias Kerner (MPP Munich) Ludovic Michel Scyboz (Max-Planck-Institut fur Physik (DE))