The Matrix Element Method and QCD Radiation

Abstract

The matrix element method (MEM) has been extensively used for the analysis of top-quark and W-boson physics at the Tevatron, but in general without dedicated treatment of initial state QCD radiation. At the LHC, the increased center of mass energy leads to a significant increase in the amount of QCD radiation, which makes it mandatory to carefully account for its effects. We here present several methods for inclusion of QCD radiation effects in the MEM, and apply them to mass determination in the presence of multiple invisible particles in the final state. We demonstrate significantly improved results compared to the standard treatment.

15 pp; v2: references and some clarifications added; v3: discussion of NLO effects, version published in PRD

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• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• QCD radiation in the production of heavy colored particles at the LHC
• A Review of the Mass Measurement Techniques proposed for the Large Hadron Collider
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