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题名: ATLAS Z-peaked excess in the MSSM with a light sbottom or stop
作者: Kobakhidze, A;  Liu, N;  Wu, L;  Yang, JM
刊名: PHYSICAL REVIEW D
出版日期: 2015
卷号: 92, 期号:7, 页码:75008
学科分类: Astronomy & Astrophysics ;  Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.92.075008
通讯作者: Liu, N (reprint author), Henan Normal Univ, Coll Phys & Elect Engn, Xinxiang 453007, Peoples R China.
文章类型: Article
英文摘要: We attempt to explain the recent ATLAS 3 sigma excess of dilepton events with an invariant mass near Z peak through the gluino-mediated sbottom production in a simplified scenario inspired by the minimal supersymmetric Standard Model. The additional Z bosons can be produced through the cascade decay chain (g) over tilde -> b (b) over tilde1(dagger) -> b (b) over bar(chi) over tilde (0)(2,3) -> b (b) over bar(chi) over tilde (0)(1)Z, in which (b) over tilde (1) is the right-handed sbottom, (chi) over tilde (0)(1) is the bino-like lightest supersymmetric particle (LSP) and (chi) over tilde (0)(2,3) are two nearly degenerate Higgsino-like next-to LSPs. Taking into account the constraint from the LHC search for the gluino-mediated sbottom production in the final states with the missing transverse energy and at least three b-jets, we find that the ATLAS on-Z excess can only be marginally explained at the 2 sigma level. We also note that within the scenario where the gluino predominantly decays to the right-handed stop instead of the sbottom, the excess can hardly be explained, since the Z-boson is not produced in the stop dominant decay channel, (t) over tilde (1) -> b (chi) over tilde (+)(1).
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: PP COLLISIONS ;  LHC ;  SEARCH ;  DETECTOR ;  PARTICLE ;  SQUARK ;  BOSON ;  MODEL
收录类别: SCI
项目资助者: Australian Research Council ;  National Natural Science Foundation of China (NNSFC) [11275057, 11305049, 11405047, 11375001] ;  Specialized Research Fund for the Doctoral Program of Higher Education [20134104120002]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20837
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
Kobakhidze, A,Liu, N,Wu, L,et al. ATLAS Z-peaked excess in the MSSM with a light sbottom or stop[J]. PHYSICAL REVIEW D,2015,92(7):75008.
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