Top quark forward-backward asymmetry from SU(Nc) color

Robert Foot
Phys. Rev. D 83, 114013 – Published 3 June 2011

Abstract

We argue that the tt¯ production asymmetry observed at the Tevatron might be simply explained if the standard SU(3)c QCD theory is extended to SU(Nc) which is spontaneously broken at a scale just above the weak scale. The extended gauge interactions amplify the radiative QCD contribution to the asymmetry and can potentially explain the observations if Nc5. This explanation suggests a relatively low SU(Nc) symmetry breaking scale 0.51TeV. We check that such a low SU(Nc) symmetry breaking scale is consistent with current collider data. Importantly this scenario predicts an abundance of striking phenomena which will be probed at the LHC. The SU(Nc) model also illustrates the idea that a beyond standard model contribution to the tt¯ asymmetry might arise primarily via radiative corrections rather than at tree level.

  • Figure
  • Figure
  • Received 16 March 2011

DOI:https://doi.org/10.1103/PhysRevD.83.114013

© 2011 American Physical Society

Authors & Affiliations

Robert Foot*

  • ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Melbourne, Victoria 3010, Australia

  • *rfoot@unimelb.edu.au

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Issue

Vol. 83, Iss. 11 — 1 June 2011

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