希格斯玻色子衰變至雙 W 玻色子測量之理論誤差估計

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研究生：	林慧琪 Lin, Hui-Chi
論文名稱：	希格斯玻色子衰變至雙 W 玻色子測量之理論誤差估計 Theoretical uncertainty estimation in the 𝐻 → 𝑊𝑊∗ decay channel using 𝑝𝑝 collisions at √𝑠 =13 TeV with the ATLAS detector
指導教授：	徐百嫻 Hsu, Pai-Hsien
口試委員:	張敬民 Cheung, Kingman 徐士傑 Hsu, Shih-Chieh 陳凱風 Chen, Kai-Feng
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：	2021
畢業學年度：	109
語文別：	英文
論文頁數：	50
中文關鍵詞：	粒子物理實驗、大強子對撞機、希格斯玻色子、超環面儀器
外文關鍵詞：	Experimental particle physics, Simplified Template Cross Sections (STXS)
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此篇論文探討在大強子對撞機第二階段運行之希格斯玻色子測量中，理論誤差的估算方法及結果。本文主要分為兩個部分：第一部分討論在希格斯玻色子衰變至雙W玻色子的測量中，膠子融合機制的理論誤差於向量玻色子融合機制測量中所造成的影響，以及雙W玻色子背景估計的理論誤差在膠子融合機制測量中的影響。第二部分探討在Simplified Template Cross Sections階段1.2的測量中，膠子融合機制理論誤差的估算方法與結果。

The study presents the state-of-the-art evaluation of the theoretical uncertainties and is divided into two parts: The first part is for the ggF (gluon-gluon fusion) and VBF (vector-boson-fusion) coupling analysis in the H→WW* decay, focusing on the ggF scale uncertainty in the VBF phase space as well as the gg→WW scale uncertainty in the ggF 0-jet and 1-jet regions. The second part is for the uncertainty scheme used in the ggF STXS (Simplified Template Cross Sections) Stage 1.2 and focuses on the evaluation of the Higgs pT migration uncertainty in the 1-jet exclusive and 2-jet inclusive bins for the Higgs pT 0-200 GeV region.

Ch1 Introduction --1
1 Overview of the H→WW Couplings and STXS Analysis with Run-2 Data --1
2 Theoretical Uncertainties --2

Ch2 The ATLAS Detector and Data Samples --5
1 The ATLAS Detector --5
2 Event Reconstruction --7
3 Monte Carlo Simulation --8

Ch3 Signal and Background Processes of the H→WW Analysis --11
1 ggF and VBF Production Channels --11
2 Properties of The H→WW Decay --11
3 Backgrounds --12

Ch4 Event Selections for the H→WW Couplings Analysis --14
1 Observable Definitions --15
2 Pre-selections --19
3 Signal Region Selections --20
4 WW Control Region Selections --22

Ch5 QCD Scale Uncertainties in the H→WW Coupling Analysis --27
1 Overview --27
2 ggF Scale Uncertainty in the VBF SR --29
3 gg→WW Scale Uncertainty in the ggF SR and WW CR --30
4 Results --36

Ch6 Higgs pT Migration Uncertainty in the ggF STXS 1.2 --37
1 Simplified Template Cross Sections --37
2 Development of the Uncertainty Scheme for the ggF STXS Stage 1.2 --39
3 Investigate mjj Dependence of pHT Uncertainty in the ≥2-jet Region --41
4 Analysis Strategy: Long-range ST Method --41
5 Evaluation of the Higgs pT Migration Uncertainty with the long-range ST Method --43

Ch7 Conclusion --45
                                

[1] Massimiliano Grazzini, Stefan Kallweit, Marius Wiesemann, and Jeong Yeon Yook. W+W− production at the LHC: NLO QCD corrections to the loop-induced gluon fusion channel. Physics Letters B, 804:135399, 2020.

[2] Tom Melia, Kirill Melnikov, Raoul Rontsch, Markus Schulze, and Giulia Zan-derighi. Gluon fusion contribution to W+W− + jet production. Journal of High Energy Physics, 2012.

[3] M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B. Abeloos, D.K. Abhayasinghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, and et al. Measurements of gluon–gluon fusion and vector-boson fusion Higgs boson production cross-sections in the H→WW∗ → eν μν decay channel in pp collisions at √s=13 TeV with the ATLAS detector. Physics Letters B, 789:508–529, Feb 2019.

[4] ATLAS Collaboration. The ATLAS experiment at the CERN Large Hadron Collider. Journal of Instrumentation, 3(08):S08003–S08003, Aug 2008.

[5] G. Aad, B. Abbott, D.C. Abbott, A. Abed Abud, K. Abeling, D.K. Abhayas- inghe, S.H. Abidi, O.S. AbouZeid, N.L. Abraham, H. Abramowicz, and et al. Electron and photon performance measurements with the ATLAS detector using the 2015–2017 LHC proton-proton collision data. Journal of Instrumentation, 14(12):P12006–P12006, Dec 2019.

[6] ATLAS Collaboration. Muon reconstruction and identification efficiency in ATLAS using the full run 2 pp collision data set at √s = 13 TeV, 2020.

[7] Matteo Cacciari, Gavin P Salam, and Gregory Soyez. The anti-kt jet clustering algorithm. Journal of High Energy Physics, 2008(04):063–063, Apr 2008.

[8] ATLAS Collaboration. Tagging and suppression of pileup jets with the ATLAS detector. Technical report, CERN, Geneva, May 2014.

[9] Keith Hamilton, Paolo Nason, Emanuele Re, and Giulia Zanderighi. NNLOPS simulation of Higgs boson production. Journal of High Energy Physics, 2013(10), Oct 2013.

[10] Torbjorn Sjostrand, Stefan Ask, Jesper R. Christiansen, Richard Corke, Nishita Desai, Philip Ilten, Stephen Mrenna, Stefan Prestel, Christine O. Rasmussen, and Peter Z. Skands. An introduction to Pythia 8.2. Computer Physics Communications, 191:159–177, Jun 2015.

[11] Jon Butterworth, Stefano Carrazza, Amanda Cooper-Sarkar, Albert De Roeck, Joel Feltesse, Stefano Forte, Jun Gao, Sasha Glazov, Joey Huston, Zahari Kassabov, and et al. PDF4LHC recommendations for LHC Run II. Journal of Physics G: Nuclear and Particle Physics, 43(2):023001, Jan 2016.

[12] Charalampos Anastasiou, Claude Duhr, Falko Dulat, Elisabetta Furlan, Thomas Gehrmann, Franz Herzog, Achilleas Lazopoulos, and Bernhard Mistlberger. High precision determination of the gluon fusion higgs boson cross-section at the LHC, 2016.

[13] Marco Bonetti, Kirill Melnikov, and Lorenzo Tancredi. Higher order corrections to mixed QCD-EW contributions to Higgs boson production in gluon fusion. Physical Review D, 97(5), Mar 2018.

[14] J. Alwall, R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, H.-S. Shao, T. Stelzer, P. Torrielli, and M. Zaro. The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations. Journal of High Energy Physics, 2014(7), Jul 2014.

[15] Enrico Bothmann, Gurpreet Singh Chahal, Stefan Hoche, Johannes Krause, Frank Krauss, Silvan Kuttimalai, Sebastian Liebschner, Davide Napoletano, Marek Schonherr, Holger Schulz, and et al. Event generation with sherpa 2.2. SciPost Physics, 7(3), Sep 2019.

[16] Fabrizio Caola, Kirill Melnikov, Raoul Rontsch, and Lorenzo Tancredi. QCD corrections to W+ W− production through gluon fusion. Physics Letters B, 754:275–280, Mar 2016.

[17] T. Plehn, D. Rainwater, and D. Zeppenfield. Method for identifying H→ τ →τ e±μ∓pT at the CERN LHC. Phys. Rev. D, 61:093005, Apr 2000.

[18] C.G Lester and D.J Summers. Measuring masses of semi-invisibly decaying particle pairs produced at hadron colliders. Physics Letters B, 463(1):99–103, Sep 1999.

[19] ATLAS Collaboration. Object-based missing transverse momentum significance in the ATLAS detector. Technical report, CERN, Geneva, Jul 2018.

[20] Fran ̧cois Chollet et al. Keras. https://keras.io, 2015.

[21] Martin Abadi et al. TensorFlow: Large-scale machine learning on heterogeneous systems, 2015. Software available from tensorflow.org.

[22] Iain W. Stewart and Frank J. Tackmann. Theory uncertainties for Higgs mass and other searches using jet bins. Physical Review D, 85(3), Feb 2012.

[23] Rikkert Frederix and Stefano Frixione. Merging meets matching in MC@NLO. Journal of High Energy Physics, 2012.

[24] ATLAS Collaboration. Measurements of gluon fusion and vector-boson-fusion production of the Higgs boson in H → WW∗ → eνμν decays using pp collisions at √s = 13 TeV with the ATLAS detector. Technical report, CERN, Geneva, Mar 2021.

[25] S. Badger et al. Les Houches 2015: Physics at TeV colliders standard model working group report. chapter III.3: Simplified template cross sections, 2016.

[26] Stefano Catani and Massimiliano Grazzini. Next-to-next-to-leading-order subtraction formalism in hadron collisions and its application to Higgs boson production at the Large Hadron Collider. Physical Review Letters, 98(22), May 2007.

[27] ATLAS Collaboration. Evaluation of theoretical uncertainties for simplified template cross section measurements of V-associated production of the Higgs boson. Technical report, CERN, Geneva, Nov 2018.

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