Abstract
This paper presents an extension of the matrix element method to next-to-leading order in perturbation theory, for electro-weak final states. 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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ArXiv ePrint: 1204.4424
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Campbell, J.M., Giele, W.T. & Williams, C. The matrix element method at next-to-leading order. J. High Energ. Phys. 2012, 43 (2012). https://doi.org/10.1007/JHEP11(2012)043
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DOI: https://doi.org/10.1007/JHEP11(2012)043