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Wang, Daohan1,2,3; Wu, Lei4,5; Zhang, Mengchao1
Hunting for top partner with a new signature at the LHC
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordLEADING-ORDER PREDICTIONS QUARKS
AbstractA vector-like top partner plays a central role in many new physics models that attempt to address the hierarchy problem. The top partner is conventionally assumed to decay to a quark and a Standard Model (SM) boson. However, it is also possible that the top partner decays to a non-SM scalar and a top quark. Such an exotic decay channel can be the main decay channel of top partners, and thus provides new windows to search for top partners at the LHC. In this paper, with the classical machine learning method of boosted decision trees, we perform a model-independent study of the discovery potential of this new signature at the LHC. In order to suppress the main QCD background, we consider the subdominant but clean decay channel a -> gamma gamma. For completeness, the single production process and pair production process of top partners are taken into account. We find that, for both single and pair production, the future high-luminosity LHC can exclude a top partner mass up to the TeV scale through the channel T -> ta (a -> gamma gamma), even if BR(a -> gamma gamma) is as small as O(0.1%). Besides, our result shows that single production can overmatch pair production at the 14 TeV LHC, provided that the top partner is heavier than 800-900 GeV.
2021
ISSN2470-0010
Volume103Issue:11Pages:115017
Cooperation Status国内
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
DOI10.1103/PhysRevD.103.115017
Indexed BySCIE
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/27357
CollectionSCI期刊论文
Affiliation1.Jinan Univ, Dept Phys, Guangzhou 510632, Peoples R China
2.Jinan Univ, Siyuan Lab, Guangzhou 510632, Peoples R China
3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
4.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
5.Nanjing Normal Univ, Dept Phys, Nanjing 210023, Peoples R China
6.Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Peoples R China
Recommended Citation
GB/T 7714
Wang, Daohan,Wu, Lei,Zhang, Mengchao. Hunting for top partner with a new signature at the LHC[J]. PHYSICAL REVIEW D,2021,103(11):115017.
APA Wang, Daohan,Wu, Lei,&Zhang, Mengchao.(2021).Hunting for top partner with a new signature at the LHC.PHYSICAL REVIEW D,103(11),115017.
MLA Wang, Daohan,et al."Hunting for top partner with a new signature at the LHC".PHYSICAL REVIEW D 103.11(2021):115017.
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