LHC predictions from a tevatron anomaly in the top quark forward-backward asymmetry

  • Yang Bai
  • JoAnne L. Hewett
  • Jared Kaplan
  • Thomas G. Rizzo
Open Access
Article

DOI: 10.1007/JHEP03(2011)003

Cite this article as:
Bai, Y., Hewett, J.L., Kaplan, J. et al. J. High Energ. Phys. (2011) 2011: 3. doi:10.1007/JHEP03(2011)003

Abstract

We examine the implications of the recent CDF measurement of the top-quark forward-backward asymmetry, focusing on a scenario with a new color octet vector boson at 1-3 TeV. We study several models, as well as a general effective field theory, and determine the parameter space which provides the best simultaneous fit to the CDF asymmetry, the Tevatron top pair production cross section, and the exclusion regions from LHC dijet resonance and contact interaction searches. Flavor constraints on these models are more subtle and less severe than the literature indicates. We find a large region of allowed parameter space at high axigluon mass and a smaller region at low mass; we match the latter to an SU(3)1 × SU(3)2/SU(3)c coset model with a heavy vector-like fermion. Our scenario produces discoverable effects at the LHC with only 1–2 fb−1 of luminosity at \( \sqrt {s} = 7 - 8\;{\text{TeV}} \). Lastly, we point out that a Tevatron measurement of the b-quark forward-backward asymmetry would be very helpful in characterizing the physics underlying the top-quark asymmetry.

Keywords

Beyond Standard Model Heavy Quark Physics 
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© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Yang Bai
    • 1
  • JoAnne L. Hewett
    • 1
  • Jared Kaplan
    • 1
  • Thomas G. Rizzo
    • 1
  1. 1.SLAC National Accelerator LaboratoryMenlo ParkU.S.A.

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