2-9 July 2014
Valencia, Spain
Europe/Madrid timezone

Constraining top-Z couplings through ttb+Z production at the LHC

3 Jul 2014, 16:55
15m
Sala 3+4 (Valencia, Spain)

Sala 3+4

Valencia, Spain

Oral presentation Top-quark and ElectroWeak Physics Top-quark and ElectroWeak Physics

Speaker

Dr. Raoul Rontsch (Fermilab)

Description

The LHC has observed top-pair production in association with electroweak gauge bosons in the 7 TeV dataset, with many more events expected at the higher energy and luminosity run. This allows the EW interactions of the top, previously only constrained indirectly, to be investigated directly. I will present a calculation of ttbar+Z production to NLO in QCD, including decays of the top and Z boson in the narrow-width approximation, and retaining all spin correlations. Using this calculation, I will put constraints on the top-Z coupling from the measured CMS 7 TeV cross-section. Using the opening angle of the leptons arising from the Z decay, I will consider future constraints from the 13 TeV LHC run. In both cases, the lower scale uncertainty and reasonably large k-factor associated with the NLO predictions allows greater sensitivity to the top-Z couplings.

Primary author

Dr. Raoul Rontsch (Fermilab)

Co-author

Dr. Markus Schulze (CERN)

Presentation Materials

Paper

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