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Search for the singlet vector-like top quark in the T→tZ channel with Z→vv at hadron colliders

Chinese Physics C 2023年第4期47卷 101-109页

作者：韩琳王世钰尚亮亮杨炳方 School of Medical Engineering Xinxiang Medical UniversityXinxiang 453003China School of Physics Henan Normal UniversityXinxiang 453007China

Based on a simplified model including a singlet vector-like top quark T with charge|Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadronhadron *** simplified model only includes two free parameters,the coupling constant g^(*)and the T quark mass m_(T).To investigate the observability of the single T production,we perform a detailed background analysis and detector simulation for the collision energies 14 TeV,27 TeV,and 100 *** scan the g^(*)-m_(T)parameter space and show the exclusion and discovery capabilities on the T quark with the highest integrated luminosity designed at these ***,the limits from the narrow-width approximation and electro weak precision observables are considered.

关键词： vector-like quark hadron collider detector simulation

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Neutral Higgs Boson Pair Production in Standard Model with the Fourth GenerationQuarks at LHC

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Communications in Theoretical Physics 2004年第1期41卷 73-78页

作者： SUNHao MAWen-Gan ZHOUYa-Jin SUNYan-Bin ZHANGRen-You HOUHong-Sheng DepartmentofModernPhysics UniversityofScienceandTechnologyofChinaHefei230027China

We investigated the neutral Higgs boson pair production at the CERN Large hadron collider (LHC) in the SM with four families. We found that the gluon-gluon fusion mode is the most dominant one in producing neutral Higgs boson pair at the LHC, and it can be used to probe the trilinear Higgs coupling. If the heavy quarks of the fourth generation really exist within the SM, they can manifest their effect on the cross section of the Higgs pair production process at the LHC. Our numerical results show that there will be neutral Higgs boson pair production events per year if the next generation heavy quarks really exist, while there will be only events produced per year if there are only three families in the SM.

关键词： standard model four generations neutral Higgs boson pair production hadron collider

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Discovery potential of Higgs boson pair production through 4■+■ final states at a 100 TeV collider

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Chinese Physics C 2017年第2期41卷 74-94页

作者：赵笑然李强李钊晏启树 Centre for Cosmology Particle Physics and Phenomenology (CP3) Universite Catholique de Louvain Chemin du Cyclotron 2 B-1348 Louvain-la-Neuve Belgium Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China School of Physics Sciences University of Chinese Academy of Sciences Beijing 100049 China Center for Future High Energy Physics CAS Beijing 100049 China

We explore the discovery potential of Higgs pair production at a 100 Te V collider via full leptonic *** same mode can be explored at the LHC when Higgs pair production is enhanced by new physics. We examine two types of fully leptonic final states and propose a partial reconstruction method, which can reconstruct some useful kinematic observables. It is found that the m T2 variable determined by this reconstruction method and the reconstructed visible Higgs mass are crucial to discriminate the signal and background events. It is also noticed that a new variable, denoted as △m, which is defined as the mass difference of two possible combinations, is very useful as a discriminant. To examine the detector effects, we consider seven detector setups for a 100 Te V collider and investigate the changes in the sensitivity, and we find that lepton isolation and the minimal lepton P t cut are crucial in order to reduce the integrated luminosity.

关键词： Higgs pair hadron collider leptonic mode

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