Merging meets matching in MC@NLO

Summary, in English

The next-to-leading order accuracy for MC@NLO results exclusive in J light jets is achieved if the computation is based on matrix elements that feature J and J + 1 QCD partons. The simultaneous prediction of observables which are exclusive in different light-jet multiplicities cannot simply be obtained by summing the above results over the relevant range in J; rather, a suitable merging procedure must be defined. We address the problem of such a merging, and propose a solution that can be easily incorporated into existing MC@NLO implementations. We use the automated aMC@NLO framework to illustrate how the method works in practice, by considering the production at the 8 TeV LHC of a Standard Model Higgs in association with up to J = 2 jets, and of an e ⁺ ν_e pair or a tt̄ pair in association with up to J = 1 jet.

• Author: Rikkert Frederix; Stefano Frixione
• Publishing year: 2012-12
• Language: English
• Publication/Series: Journal of High Energy Physics
• Volume: 2012
• Issue: 12
• Links: http://dx.doi.org/10.1007/JHEP12(2012)061
• Document type: Journal article
• Publisher: Springer
• Topic: Subatomic Physics; Computational Mathematics
• Keywords: Monte Carlo Simulations; NLO Computations
• Status: Published
• ISBN/ISSN/Other: ISSN: 1029-8479