Combining Monte Carlo generators with next-to-next-to-leading order calculations: Event reweighting for Higgs boson production at the LHC

Giovanna Davatz*, Fabian Stöckli, Charalampos Anastasiou, Günther Dissertori, Michael Dittmar, Kirill Melnikov, Frank Petriello

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We study a phenomenological ansatz for merging next-to-next-to-leading order (NNLO) calculations with Monte Carlo event generators. We reweight them to match bin-integrated NNLO differential distributions. To test this procedure, we study the Higgs boson production cross-section at the LHC, for which a fully differential partonic NNLO calculation is available. We normalize PYTHIA and MC@NLO Monte Carlo events for Higgs production in the gluon fusion channel to reproduce the bin integrated NNLO double differential distribution in the transverse momentum and rapidity of the Higgs boson. These events are used to compute differential distributions for the photons in the ppHγγ decay channel, and are compared to predictions from fixed-order perturbation theory at NNLO. We find agreement between the reweighted generators and the NNLO result in kinematic regions where we expect a good description using fixed-order perturbation theory. Kinematic boundaries where resummation is required are also modeled correctly using this procedure. We then use these events to compute distributions in the ppHW+W-l +l-ν channel, for which an accurate description is needed for measurements at the LHC. We find that the final state lepton distributions obtained from PYTHIA are not significantly changed by the reweighting procedure.

Original languageEnglish (US)
Article number037
JournalJournal of High Energy Physics
Volume2006
Issue number7
DOIs
StatePublished - Jul 1 2006

Keywords

  • Hadronic Colliders
  • Higgs Physics
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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