750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model

Liu Ning; Wang Wen-Yu; Zhang Meng-Chao; Zheng Rui

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750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model

Liu Ning 1 * #,Wang Wen-Yu 2,Zhang Meng-Chao 3,Zheng Rui 4

1.Institute of Theoretical Physics, Henan Normal University, Xinxiang 45300

2.Institute of Theoretical Physics, College of Applied Science, Beijing University of Technology, Beijing 100124

3.Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100190

4.Department of Physics, University of California, Davis, CA 95616

*Correspondence author

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Funding: Startup Foundation for Doctors of Henan Normal University（No.11112）, Specialized Research Fund for Doctoral Program of Higher Education （No.20134104120002）

Opened online:11 May 2017

Accepted by: none

Citation: Liu Ning,Wang Wen-Yu,Zhang Meng-Chao.750 GeV Diphoton Resonance in a Vector-like Extension of Hill Model[OL]. [11 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4730538

In this paper, we study the recent 750 GeV diphoton excess in the Hill Model with vector-like fermions, in which the singlet-like Higgs boson is chosen as 750 GeV resonance and is mainly produced by the gluon fusion through vector-like top and bottom quarks. Meanwhile its diphoton decay rate is greatly enhanced by the vector-like lepton. Under the current experimental and theoretical constraints, we present the viable parameter space that fits the 750 GeV diphoton signal strength at 13 TeV LHC. We find that the heavier vector-like fermion masses are, the smaller mixing angle $ heta$ is required. The mixing angle of singlet and doublet Higgs bosons is constrained within $|sin heta| lesssim 0.15$ in the condition of the perturbative Yukawa couplings. In the allowed parameter space, the 750 GeV diphoton cross section can be maximally enhanced to about 6 fb at 13 TeV LHC.

Keywords:Diphoton; Hill Model; Higgs boson

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