Top quark forward-backward asymmetry in the little Higgs model

GUO Xing-Dao; ZHANG Yin-Jie; ZHAO Shu-Min; FENG Tai-Fu; YUAN Xu-Hao; LI Xue-Qian

doi:10.1088/1674-1137/38/11/113102

Chinese Physics C> 2014, Vol. 38> Issue(11) : 113102 DOI: 10.1088/1674-1137/38/11/113102

Top quark forward-backward asymmetry in the little Higgs model

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

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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 Z_H can be large enough to make up the gap between SM prediction and experimental data. Then, the parameter space for the couplings between Z_H and quarks are constrained. Thus, this model can fulfill the experimental data, both in AFB and in cross section.

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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

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Received: 2014-02-28
Revised: 2014-06-03

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2014-02-28

Accepted Date: 2014-06-03

Available Online: 2014-11-05

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 Z_H can be large enough to make up the gap between SM prediction and experimental data. Then, the parameter space for the couplings between Z_H and quarks are constrained. Thus, this model can fulfill the experimental data, both in AFB and in cross section.

Top quark forward-backward asymmetry in the little Higgs model

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通讯作者: 陈斌, bchen63@163.com

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