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arXiv 1604.00728hep-phhep-ex
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Hill模型的类矢量扩展中的750 GeV双光子共振

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

Ning Liu, Wenyu Wang, Mengchao Zhang, Rui Zheng

摘要:

本文研究了具有类矢量费米子的Hill模型中最近出现的750 GeV双光子过剩,其中类单态希格斯玻色子玻色子作为750 GeV共振,主要由类矢量顶夸克和底夸克的胶子熔合产生.同时,类矢量轻子大大提高了双光子衰变率。在目前的实验和理论的限制下,我们提出了可行的参数空间,适合750 GeV的双光子信号强度在13 TeV的LHC。我们发现类矢量费米子质量越大,所需的混合角$θ$越小。在微扰Yukawa耦合条件下,单重态和二重态希格斯玻色子的混合角被限制在$|\sinθ| \lesssim 0.15$内。在允许的参数空间内,750 GeV的双光子截面在13 TeV的LHC上可以最大地增强到约6 fb.

英文摘要:

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 $θ$ is required. The mixing angle of singlet and doublet Higgs bosons is constrained within $|\sinθ| \lesssim 0.15$ 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.

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