The Matrix Element Method at Next-to-Leading Order

Details The Matrix Element Method at Next-to-Leading Order The Matrix Element Method at Next-to-Leading Order

2012-04-19

arxiv.org/abs/1204.4424v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 9 figures

Scientific paper

This paper presents an extension of the matrix element method to next-to-leading order in perturbation theory. To accomplish this we have developed a method to calculate next-to-leading order weights on an event-by-event basis. This allows for the definition of next-to-leading order likelihoods in exactly the same fashion as at leading order, thus extending the matrix element method to next-to-leading order. A welcome by-product of the method is the straightforward and efficient generation of unweighted next-to-leading order events. As examples of the application of our next-to-leading order matrix element method we consider the measurement of the mass of the Z boson and also the search for the Higgs boson in the four lepton channel.

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