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Single top partner production in the tZ channel at eγ collision in the littlest Higgs model with T-parity

Communications in Theoretical Physics 2020年第8期72卷 79-86页

作者： Bingfang Yang Hengheng Bi Biaofeng Hou Bingjie Wu School of Physics Henan Normal UniversityXinxiang 453007China College of Physical Science and Technology Central China Normal UniversityWuhan 430079China College of Physics and Electronic Engineering Zhengzhou Normal UniversityZhengzhou 450044China

Introducing the top partner is a common way to cancel the largest quadratically divergent contribution to the Higgs mass induced by the top quark. In this work, we study single top partner production in the tZ channel at eγ collision in the littlest Higgs model with T-parity(LHT). Since it is well known that polarized beams can enhance the cross section, we analyze the signal via polarized electron beams,and photon beams. we have selected two decay modes for comparison, based on the leptonic or the hadronic decays of the W and Z from the top partner. We then construct a detailed detector simulation, and choose a set of cuts to enhance signal significance. For mode A(B), the capacity for exclusion in this process at s1/2=3TeV is comparable to the current experimental limits with L=1000(500) fb-1. If the integrated luminosity can be increased to 3000 fb-1, the top partner mass+mTcan be excluded up to 1350(1440) GeV at 2σ level. We also considered the initial state radiation effect, and find that this effect reduces the excluding ability of the eγ collision on the the top partner mass by approximately 10 GeV. Moreover, the ability to exclude the LHT parameter space at eγ collision complements the existing research.

关键词： littlest Higgs model with T-parity top partner new physics eγcollider

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T-odd top partner pair production in the dilepton final states at the LHC in the littlest Higgs Model with T-parity

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Chinese Physics C 2018年第10期42卷 19-24页

作者： Bingfang Yang Huaying Zhang Biaofeng Hou Ning Liu College of Physics and Materials Science Henan Normal UniversityXinxiang 453007China Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China

In the littlest Higgs model with T-parity, we discuss the pair production of the T-odd top partner （T_） that decays almost 100% into the top quark and the lightest T-odd particle （AH）. Considering the current constraints, we investigate the observability of the T-odd top partner pair production through the process pp→T_T_ →ttAHAH in the final states with two leptons at 14 TeV LHC. We analyze the signal significance and found that the lower limits on the T-odd top partner mass are approximately 1.2 TeV, 1.3 TeV, and 1.4 TeV at the 2or confidence level at 14 TeV LHC with an integrated luminosities of 30 fb^-1, 100 fb^-1, and 300 fb^-1, respectively. This lower limit can be increased to approximately 1.5（1.6） TeV if we used 1000（3000） fb^-1 of the integrated luminosity.

关键词： top partner LHC littlest Higgs Model with T-parity

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Single vector-like top partner production in the left-right twin Higgs model at TeV energy eγ colliders

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Chinese Physics C 2013年第10期37卷 11-14页

作者：郭占营杨光杨炳方 Department of Physics Jiaozuo Normal College Basic Teaching Department Jiaozuo University College of Physics and Information Engineering Henan Normal University

The left-right twin Higgs model contains a new vector-like heavy top quark, which mixes with the SM- like top quark. In this work, we studied the single vector-like top partner production via process e-γ→ve Tb at the International Linear Collider. We calculated the production cross section at tree level and displayed the relevant differential distributions. The result shows that there will be 125 events produced each year with s=2 TeV and the integrated luminosity Lint ≈500 fb-1, and the b-quark tagging and the relevant missing energy ET cut will be helpful to detect this new effect.

关键词： top partner left-right twin Higgs model production cross section

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