Search for a Higgs boson decaying into γ∗γ → eeγ in pp collisions at ￼√s = 8 TeV with the CMS detector

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姓名

張秋萍(Chiu-Ping Chang) 查詢紙本館藏

畢業系所

物理學系

論文名稱

(Search for a Higgs boson decaying into γ∗γ → eeγ in pp collisions at √s = 8 TeV with the CMS detector)

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摘要(中)

本篇論文研究希格斯玻色子衰變成一個虛擬光子和一個光子，其中虛擬光子衰變成正負電子對，本分析使用質子-質子對撞，能量在8TeV的對撞於LHC的CMS偵測器記錄到總和亮度為19.7/fb的數據。終態為兩個非常靠近的正負電子以及一個高能量的光子，正負電子因為太靠近彼此而無法在電磁量能器內分辨為二。本實驗的結果與另一個實驗結果相互結合：希格斯玻色子衰變成一個虛擬光子和一個光子，其中虛擬光子衰變成渺子對，結果顯示在 120 GeV 到 150 GeV 重建的希格斯玻色子的質量區間並沒有過量的訊號。觀察（預測）的訊號強度上限在質量為 125 GeV 時為 6.7 (5.9+2.8-1.8) 倍的標準模型預測。

摘要(英)

A search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to an electron pair (eeγ). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7/fb. The events selected have a merged electron caused by two close-by electrons from low mass γ* decay and a high transverse momentum photon.
The results are combined with H ->γ*γ -> μμγ final state, where dimuon mass below 20 GeV. No excess above background has been found in the three-body invariant mass range 120 < m(llγ) < 150 GeV.
The observed (expected) limit for Higgs mass = 125 GeV is about 7.62(9.97+4.81-3.10) times the SM prediction for H ->γ*γ -> eeγ, 10.79(7.59+3.78-2.36) times the SM prediction for H ->γ*γ -> μμγ and 6.7(5.9+2.8-1.8) times the SM prediction for combined channel.

關鍵字(中)

★ 高能物理
★ 希格斯粒子
★ 粒子物理
★ 大強子對撞機

關鍵字(英)

★ Higgs boson
★ Particle Physics
★ LHC
★ CMS
★ High energy physics

論文目次

1 Introduction and motivation 1
1.1 Standard Model.............................. 2
1.2 Higgs Mechanism............................. 4
1.3 Review of the observation of Higgs boson . . . . . . . . . . . . . . . 8
1.4 Overview for H ->γ*γ -> eeγ ...................... 21
2 LHC and CMS detector 25
2.1 Large Hadron Collider .......................... 25
2.2 CMS detector............................... 28
3 Analysis Procedures 41
3.1 Dataand Monte Carlo samples ..................... 41
3.2 Trigger................................... 45
3.3 Objectrecon struction and selection ................... 45
3.4 Event selection .............................. 60
3.5 Background and signal modeling..................... 61
3.6 Systematic uncertainties ......................... 63
4 Results and conclusion 66
4.1 Crosssection limit computation ..................... 66
4.2 Include H ->γ*γ -> μμγ ......................... 67
4.3 Future plans................................ 69
4.4 Conclusion................................. 69

參考文獻

[1] CMS Collaboration. Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC. Phys. Lett. B, 716, 2012.[2] ATLAS Collaboration. Observation of a new particle in the search for the stan- dard model Higgs boson with the ATLAS detector at the LHC. Phys. Lett. B, 716, 2012.
[3] A. Firan and R. Stroynowski. Internal conversions in Higgs decays to two pho- tons. Phys.Rev., D76, 2007.
[4] R. Oerter. The theory of almost everything: The standard model, the unsung triumph of modern physics (kindle ed.). ISBN 0-13-236678-9, page 2, 2006.
et al.

指導教授

郭家銘(Chia-Ming Kuo)

審核日期

2015-11-19

推文