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T: Fachverband Teilchenphysik

T 36: Top-Quarks

T 36.4: Vortrag

Montag, 24. März 2014, 17:30–17:45, P102

Kinematic reconstruction of ttbar events in the dilepton decay channel with the CMS experiment — Olaf Behnke, Ganna Dolinska, and •Ievgen Korol — Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 - Hamburg

Measurements of top-quark production cross section and properties play an important role in testing the standard model (SM) and in searches for new physics beyond it. Top-quark pair production at the LHC can be studied almost background- free with the CMS detector in the dilepton decay channels, where two b-jets, two leptons (muons or electrons) and at least two neutrinos are produced in the final state. In order to study the dynamics of the top quark pair production it is necessary to fully reconstruct the kinematics of the two quarks. Here the presence of the invisible neutrinos poses a formidable challenge. In this talk we present a new kinematic reconstruction which aims to improve an existing reference method. Performance benchmarks (efficiencies, resolutions and biases) of the new method are presented and compared to those of the reference method.