Related Experiment Video
Updated: Jun 1, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Top quark forward-backward asymmetry and same-sign top quark pairs
Edmond L Berger1, Qing-Hong Cao, Chuan-Ren Chen
1High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. berger@anl.gov
Abstract:
The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z' model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the Z' to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for tt and ttj production in early LHC experiments at 7-8 TeV and conclude that if no tt signal is observed with 1 fb⁻¹ of integrated luminosity, then a nonuniversal Z' alone cannot explain the Tevatron forward-backward asymmetry.
Related Concept Videos
The Pauli Exclusion Principle
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
Atomic Nuclei: Nuclear Spin State Overview
Mass Analyzers: Common Types
Tandem Mass Spectrometry
Symmetric Member in Bending
