Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 77: Jenseits des Standardmodells (Theorie) 2

T 77.8: Talk

Wednesday, March 26, 2014, 18:30–18:45, P6

New Physics Contributions to the Top Quark Charge Asymmetry in Hadronic Collisions — •Peter Galler, Erik Matiske, and Peter Uwer — Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, D-12489 Berlin

The forward-backward charge asymmetry (FBA) in tt production is measured by the CDF collaboration at the TEVATRON with a discrepancy of about 2.0 standard deviations with respect to the Standard Model prediction. Scalars in different representations of the SU(3) color gauge group that couple top quarks to light quarks have been investigated as a source of this non-standard FBA. Because of its symmetric setup the LHC cannot measure the FBA directly. However if scalars in certain color representations exist then they can be found at the LHC or limits on their couplings can be set. The coupling strength and mass parameter space of these scalars is constrained to some extend by the CDF measurement. Considering these bounds we investigate further constraints from various LHC observables.