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研究生： 施柏杉
Shih, Po-Shan
論文名稱： 在MonoHbb分析中的Z玻色子背景估計
The Estimation of the Background of the Z Boson in the MonoHbb Analysis
指導教授： 徐百嫻
Hsu, Pai-Hsien
口試委員: 張維甫
Chang, We-Fu
張敬民
Cheung, Kingman
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2019
畢業學年度： 107
語文別： 英文
論文頁數： 32
中文關鍵詞： 暗物質 、希格斯玻色子 、大型強子對撞機 、ATLAS
外文關鍵詞： Dark Matter, Higgs Boson, LHC, ATLAS
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    • 在利用希格斯粒子衰變成一對$b$夸克，以尋找$Z^
    rime$-2HDM模型中暗物質的分析中，衰變成一對微中子$\nu$的$Z$玻色子加上探測器中強交互作用形成的噴流是主要的背景。本論文使用有與其相近運動特徵的交互作用來展示此背景的估計，此交互作用是衰變成一對輕子的$Z$玻色子加上噴流，並且附上此交互作用的分布誤差。最後，本論文展示了這個分析與前一次的結果之間的進展。分析的結論會被轉譯成此模型在95\%信心水準的排除界線。

    In the search for the dark matter of the $Z^
    rime$-2HDM model produced in association with a Higgs boson decaying to $b\bar{b}$, the $Z$($\nu\nu$) + jets is the main background process. The thesis shows the estimation of the background with the $Z$($ll$) + jets process which has similar kinematics with the shape uncertainty. In the end, the thesis presents the improvement of the analysis compared to the previous iteration. The result of the analysis is interpreted as exclusion limits of the model at 95\% confidence level.

    1 Introduction p.1 2 ATLAS Detector p.5 3 Background Estimation Strategy p.9 4 Object Reconstruction and Selection p.11 5 Event Selection p.15 6 Z Boson Background Estimation p.19 7 Systematic Uncertainties p.25 8 Results p.27

    1. Berlin, A., Lin, T. & Wang, L.-T. Mono-Higgs detection of dark matter at the LHC. Journal of High Energy Physics 2014, 78. issn: 1029-8479. https://doi.org/10.1007/ JHEP06(2014)078 (June 2014).

    2. Branco, G. et al. Theory and phenomenology of two-Higgs-doublet models. Physics Reports 516. Theory and phenomenology of two-Higgs-doublet models, 1–102. issn: 0370-1573. http://www.sciencedirect.com/science/article/pii/S0370157312000695 (2012).

    3. The ATLAS Collaboration et al. The ATLAS Experiment at the CERN Large Hadron Collider. Journal of Instrumentation 3, S08003. http://stacks.iop.org/1748-0221/3/i=08/a=S08003 (2008).

    4. Capeans, M. et al. ATLAS Insertable B-Layer Technical Design Report tech. rep. CERNLHCC-2010-013. ATLAS-TDR-19 (Sept. 2010). https://cds.cern.ch/record/1291633.

    5. Cacciari, M., Salam, G. P. & Soyez, G. The anti- k t jet clustering algorithm. Journal of High Energy Physics 2008, 063. http://stacks.iop.org/1126-6708/2008/i=04/a=063 (2008).

    6. Expected performance of the ATLAS b-tagging algorithms in Run-2 tech. rep. ATL-PHYSPUB-2015-022 (CERN, Geneva, July 2015). https://cds.cern.ch/record/2037697.

    7. Cacciari, M., Salam, G. P. & Soyez, G. The catchment area of jets. Journal of High Energy Physics 2008, 005. http://stacks.iop.org/1126-6708/2008/i=04/a=005 (2008).

    8. Cacciari, M. & Salam, G. P. Pileup subtraction using jet areas. Physics Letters B 659, 119–126. issn: 0370-2693. http://www.sciencedirect.com/science/article/pii/S0370269307011094 (2008).

    9. Krohn, D., Thaler, J. & Wang, L.-T. Jets with Variable R. eprint: arXiv:0903.0392 (2009).

    10. Measurement of the tau lepton reconstruction and identification performance in the ATLAS experiment using pp collisions at √s = 13 TeV tech. rep. ATLAS-CONF-2017-029 (CERN, Geneva, May 2017). https://cds.cern.ch/record/2261772.

    11. Aaboud, M. et al. Search for Dark Matter Produced in Association with a Higgs Boson Decaying to bb Using 36 fb−1 of pp Collisions at √s = 13 TeV with the ATLAS Detector. Phys. Rev. Lett. 119, 181804. https://link.aps.org/doi/10.1103/PhysRevLett.119.181804 (18 Nov. 2017).

    12. Object-based missing transverse momentum significance in the ATLAS detector tech. rep. ATLAS-CONF-2018-038 (CERN, Geneva, July 2018). https://cds.cern.ch/record/2630948.

    13. Optimisation and performance studies of the ATLAS b-tagging algorithms for the 2017-18 LHC run tech. rep. ATL-PHYS-PUB-2017-013 (CERN, Geneva, July 2017). https://cds.cern.ch/record/2273281.

    14. The ATLAS collaboration et al. Evidence for the H → bb decay with the ATLAS detector. Journal of High Energy Physics 2017, 24. issn: 1029-8479. https://doi.org/10.1007/JHEP12(2017)024 (Dec. 2017).

    15. Aaboud, M. et al. Luminosity determination in pp collisions at √s = 8 TeV using the ATLAS detector at the LHC. The European Physical Journal C 76, 653. issn: 1434-6052. https://doi.org/10.1140/epjc/s10052-016-4466-1 (Nov. 2016).

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