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T: Fachverband Teilchenphysik

T 40: Top Quark (Theorie) 2

T 40.6: Vortrag

Dienstag, 28. März 2017, 12:15–12:30, VSH 05

The Matrix Element Method at next-to-leading order QCD at (hadron) colliders — •Till Martini and Peter Uwer — Humboldt-Uiversitaet zu Berlin, Germany

The Matrix Element Method (MEM) has proven beneficial to make maximal use of the information available in experimental data. However, so far it has mostly been applied in Born approximation only. In this talk we discuss the extension to NLO QCD accuracy. As a prerequisite we present an efficient method to calculate event weights for jet events at NLO accuracy. As illustration and proof of concept we apply the method to the measurement of the top-quark mass in single top production at the LHC. We observe significant differences when moving from LO to NLO which may be relevant for the interpretation of top-quark mass measurements at hadron colliders relying on the MEM.