Hunting for top partner with a new signature at the LHC

doi:10.1103/PhysRevD.103.115017

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	Hunting for top partner with a new signature at the LHC
	Wang, Daohan 1,2,3; Wu, Lei 4,5; Zhang, Mengchao 1
刊名	PHYSICAL REVIEW D
	2021
卷号	103 期号:11 页码:115017
关键词	LEADING-ORDER PREDICTIONS QUARKS
ISSN号	2470-0010
DOI	10.1103/PhysRevD.103.115017
英文摘要	A 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.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27357]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.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
推荐引用方式 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.