| DC 欄位 |
值 |
語言 |
| DC.contributor | 物理學系 | zh_TW |
| DC.creator | 張秋萍 | zh_TW |
| DC.creator | Chiu-Ping Chang | en_US |
| dc.date.accessioned | 2015-11-19T07:39:07Z | |
| dc.date.available | 2015-11-19T07:39:07Z | |
| dc.date.issued | 2015 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=103222021 | |
| dc.contributor.department | 物理學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 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。 | zh_TW |
| dc.description.abstract | 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. | en_US |
| DC.subject | 高能物理 | zh_TW |
| DC.subject | 希格斯粒子 | zh_TW |
| DC.subject | 粒子物理 | zh_TW |
| DC.subject | 大強子對撞機 | zh_TW |
| DC.subject | Higgs boson | en_US |
| DC.subject | Particle Physics | en_US |
| DC.subject | LHC | en_US |
| DC.subject | CMS | en_US |
| DC.subject | High energy physics | en_US |
| DC.title | Search for a Higgs boson decaying into γ∗γ → eeγ in pp collisions at √s = 8 TeV with the CMS detector | en_US |
| dc.language.iso | en_US | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |