Search for the rare decays of Z and Higgs bosons to J/ψ plus photon at √s = 13 TeV

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鄭皓仁(Hao-Ren Jheng) 查詢紙本館藏

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物理學系

論文名稱

(Search for the rare decays of Z and Higgs bosons to J/ψ plus photon at √s = 13 TeV)

相關論文

★ 利用CMS探測器量測7TeV下的Zγ產生截面	★ 以CMS 偵測器在質心質量為8TeV使用雙渺子和三秒子頻道尋找雙電荷希格斯玻色子
★ 在質子對撞能量8TeV下尋找具有雙電子雙渺子末態的激發態輕子	★ Measurement of Zγ production in 5 fb-1 of pp collisions at √s = 7 TeV with the CMS detector
★ Search for a Higgs boson decaying into γ∗γ → eeγ in pp collisions at √s = 8 TeV with the CMS detector	★ Measurement of Z boson production in the electron decay channel in p+Pb collisions at √sNN = 5.02 TeV with the CMS detector
★ 火花偵測器的製成	★ Search for the production of two Higgs bosons in the final state with two photons and two b quarks in proton-proton collision at √s = 13 TeV
★ Search for Exotic Decay of A Higgs Boson into A Dark Photon and a Standard Model Photon in pp Collisions at √s = 13 TeV	★ Search for a Higgs boson decay into γ*γ→μμγ in pp collisions at √s = 13 TeV
★ Measurement of Zγ production cross section in pp collisions at sqrt(s) = 13 TeV with the CMS detector	★ Search for H→Zγ→bbγ produced in association with a Z boson in proton-proton collisions at √s = 13 TeV with the CMS detector at the LHC
★ nono	★ TCAD simulation of silicon detector
★ Assembly and Beam Test Analysis of sPHENIX INTT Detector	★ 研究 Dalitz Higgs 的 Muon 效率用於 Run II 和多變量電子用於 CMS 的 Run III

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摘要(中)

本篇論文目的為尋找Z玻色子和希格斯玻色子衰變至一個J/ψ介子和一個光子的頻道，其中J/ψ介子進一步衰變至渺子對 (μ+μ−)。此分析使用於2016年由大型強子對撞機 (LHC)產生的質子對撞，質心能量為13兆電子伏特 (TeV)，並由緊湊緲子線圈 (CMS) 所收集，對應於總光度35.9飛靶 (inverse femto-barn)之事件。若J/ψ介子不帶極性，在95%信心水準下，Z玻色子衰變頻道之衰變分支比例的觀測上限為1.4×10−6，約對應至15倍的標準模型預測值。假設J/ψ介子帶有縱向或橫向極性，衰變分支比例的觀測上限對應於不帶極性之假設有-13.6至+8.6%的差異。在J/ψ介子帶有橫向極性且在95%信心水準下，希格斯玻色子衰變頻道之衰變分支比例的觀測上限為7.6×10−4，約對應至260倍的標準模型預測值。在統計上，此希格斯玻色子衰變頻道之結果與由質心能量8兆電子伏特所得到之結果合併計算，得到衰變分支比例的觀測上限約對應至220倍的標準模型預測值。

摘要(英)

A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ+μ−. The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb−1 at √s = 13 TeV collected with the CMS detector at the LHC. The observed limit on the Z→J/ψ γ
decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4×10−6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from -13.6 to +8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H→J/ψ γ where the J/ψ meson is assumed to be transversely polarized is 7.6×10−4, a factor of 260 larger than the standard model prediction. The results for the Higgs boson
are combined with previous data from proton-proton collisions at √s = 8 TeV to produce an observed upper limit on the branching fraction for H→J/ψ γ that is a factor of 220 larger than the standard model value.

關鍵字(中)

★ 大型強子對撞機
★ 緊湊渺子線圈
★ Z玻色子
★ 希格斯玻色子
★ 稀有衰變

關鍵字(英)

★ Z boson
★ Higgs boson
★ rare decays
★ LHC
★ CMS

論文目次

1 Introduction 1
1.1 Thestandardmodelofparticlephysics.................. 1
1.1.1 Gaugeinvariance.......................... 2
1.1.2 Weak interaction and the electroweak unification . . . . . . . 6
1.1.3 TheHiggsmechanism....................... 13
1.1.4 The production of the Higgs boson and its decays . . . . . . . 21
1.1.5 ThemeasurementoftheHiggscouplings . . . . . . . . . . . . 28
1.2 TheraredecaysZ/H!J/yg....................... 35 1.2.1 Overview .............................. 35 1.2.2 Featuresofthedecays ....................... 37
1.2.3 Previous results from the ATLAS and CMS Collaborations . . 39
2 Experimental apparatus 43
2.1 LargeHadronCollider ........................... 43
2.2 CompactMuonSolenoid.......................... 45
2.3 Objectreconstruction............................ 52
2.3.1 Particle-Flowalgorithm ...................... 52 2.3.2 Pile-up&Primaryvertex ..................... 58
3 Analysis procedures 60
3.1 Dataandsimulatedsamples........................ 60 3.1.1 Datasample............................. 60 3.1.2 Simulatedsamples ......................... 61
3
3.2 Trigger .................................... 69
3.3 Objectidentification............................. 80 3.3.1 Muonidentification ........................ 80 3.3.2 Photonidentification........................ 88
3.4 EventSelection ............................... 89
3.5 Backgroundmodeling ...........................108 3.5.1 F-test.................................109 3.5.2 Biasstudy ..............................111
3.6 Signalmodeling...............................124
3.7 Systematicuncertainties ..........................124
3.8 Statisticalmethod..............................133
4 Results and conclusion 140
4.1 Limitsondecaybranchingfraction....................140 4.2 Conclusion..................................142 4.3 Outlook....................................143
A Additional materials for the bias study 145
A.1 Linearity ...................................145
A.1.1 H!J/yg..............................146
A.1.2 Z!J/ygCat1...........................148
A.1.3 Z!J/ygCat2...........................150
A.1.4 Z!J/ygCat3...........................152
A.2 Pseudo-event ................................154
A.2.1 Pseudo-eventsforH!J/yg...................155
A.2.2 Pseudo-eventsforCat1ofZ!J/yg. . . . . . . . . . . . . . . 156
A.2.3 Pseudo-eventsforCat2ofZ!J/yg . . . . . . . . . . . . . .157
A.2.4 Pseudo-eventsforCat3ofZ!J/yg . . . . . . . . . . . . . .158
B Discussion on the systematic uncertainties 159
C Beam test for the CMS high granularity endcap calorimeter in 2018 165
C.1 BDTmethodforenergyreconstruction. . . . . . . . . . . . . . . . . .167 C.2 Electronandpionseparation .......................177
C.3 Machine learning technique for Electron and pion separation . . . . . 182
Bibliography 191

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指導教授

郭家銘(Chia-Ming Kuo)

審核日期

2019-6-24

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