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T: Fachverband Teilchenphysik
T 73: Top-Quarks: Eigenschaften und Zerfälle III
T 73.6: Vortrag
Donnerstag, 22. März 2018, 17:50–18:05, Philo-HS1
Towards a differential measurement of the ttZ cross section with the CMS experiment — •Joscha Knolle and Andreas B. Meyer — DESY, Hamburg, Germany
The production of a top quark pair in association with a Z boson is a direct probe of the top quark–Z boson coupling and can now, as the LHC collects more and more data, be measured precisely.
The CMS collaboration has reported a measurement of the ttZ cross section at √s=13 TeV with 35.9 fb−1 of data recorded in 2016 that is in agreement with the Standard Model prediction. Extending this measurement with data (to be) recorded in 2017 and 2018, a first differential measurement will be possible. With differential cross sections, the weak dipole moments of the top quark–Z boson interaction can be probed, thus allowing to constrain contributions from New Physics.
In my talk, I will present first studies on the ttZ measurement in the three-lepton channel, where an opposite-sign same-flavour lepton pair comes from the Z boson decay and the third lepton from the semi-leptonically decaying top quark pair, using full 2017 data.