Top quark forward-backward asymmetry in the little Higgs model

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GUO Xing-Dao, ZHANG Yin-Jie, ZHAO Shu-Min, FENG Tai-Fu, YUAN Xu-Hao and LI Xue-Qian. Top quark forward-backward asymmetry in the little Higgs model[J]. Chinese Physics C, 2014, 38(11): 113102. doi: 10.1088/1674-1137/38/11/113102
GUO Xing-Dao, ZHANG Yin-Jie, ZHAO Shu-Min, FENG Tai-Fu, YUAN Xu-Hao and LI Xue-Qian. Top quark forward-backward asymmetry in the little Higgs model[J]. Chinese Physics C, 2014, 38(11): 113102.  doi: 10.1088/1674-1137/38/11/113102 shu
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Received: 2014-02-28
Revised: 2014-06-03
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Top quark forward-backward asymmetry in the little Higgs model

    Corresponding author: ZHAO Shu-Min,
    Corresponding author: FENG Tai-Fu,
  • 1.  Department of Physics and Technology, Hebei University, Baoding 071002, China
  • 2.  Center for High Energy Physics, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 3.  Department of Physics, Nankai University, Tianjin 300071, China

Abstract: A sizable difference in top quark pair forward backward asymmetry (AFB) is observed at Tevatron. The discrepancy triggers many new physics beyond the standard model (SM) and then constrains the parameter spaces in them. In this article we calculate the AFB of the top-pair production at Tevatron up to next to leading order (NLO) in the little Higgs model (LHM). We find that the contribution of ZH can be large enough to make up the gap between SM prediction and experimental data. Then, the parameter space for the couplings between ZH and quarks are constrained. Thus, this model can fulfill the experimental data, both in AFB and in cross section.

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