LHC Predictions from a Tevatron Anomaly in the Top Quark Forward-Backward Asymmetry

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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 ... continued below

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36 pages

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Bai, Yang; Hewett, JoAnne L.; Kaplan, Jared; Rizzo, Thomas G. & /SLAC August 12, 2011.

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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){sub 1} x SU(3){sub 2}/SU(3){sub c} coset model with a heavy vector-like fermion. Our scenario produces discoverable effects at the LHC with only 1-2 inverse femtobarns of luminosity at 7-8 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.

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36 pages

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  • Journal Name: JHEP 1103:003,2011; Journal Volume: 2011; Journal Issue: 3

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  • Report No.: SLAC-PUB-14364
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1022566
  • Archival Resource Key: ark:/67531/metadc841096

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 12, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 7, 2016, 4:31 p.m.

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Bai, Yang; Hewett, JoAnne L.; Kaplan, Jared; Rizzo, Thomas G. & /SLAC. LHC Predictions from a Tevatron Anomaly in the Top Quark Forward-Backward Asymmetry, article, August 12, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc841096/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.