Mainz 2014 – scientific programme
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T: Fachverband Teilchenphysik
T 36: Top-Quarks
T 36.9: Talk
Monday, March 24, 2014, 18:45–19:00, P102
Measurement of the Cross Section of Top Quark associated Bottom Pair Production with the CMS Experiment — •Robert Fischer1, Daniel van Asseldonk1, Martin Erdmann1, Marcel Rieger1, and Jan Steggemann2 — 1III. Physikalisches Institut A, RWTH Aachen — 2CERN
A measurement of the production of top quark pairs in association with two bottom quarks (tt+bb) is presented for events with a charged lepton and jets in the final state at a center-of-mass energy of 8 TeV using the CMS experiment. This process is of interest for comparisons with Standard Model calculations, and in particular with respect to determinations of the Yukawa coupling of the Higgs boson and the top quark. Here, tt+bb production from strong interaction processes represents the dominating irreducible background for the ttbar associated Higgs production (ttH) in the Higgs decay mode to two b quarks. The analysis categorizes events by the number of jets and b-tagged jets per event. For each category, a dedicated boosted decision tree discriminator is trained and evaluated. The resulting cross section is obtained from a Bayesian inference method taking all relevant systematic uncertainties and their correlations into account.