| DC 欄位 |
值 |
語言 |
| DC.contributor | 物理學系 | zh_TW |
| DC.creator | 沈聿陞 | zh_TW |
| DC.creator | Yu-Sheng Shen | en_US |
| dc.date.accessioned | 2023-10-5T07:39:07Z | |
| dc.date.available | 2023-10-5T07:39:07Z | |
| dc.date.issued | 2023 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=110222030 | |
| 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 | 評估希格斯玻色子罕見衰變的測量有助於理解粒子物理標準模型
（SM）以及希格斯玻色子衰變至正負電子對和光子的貢獻。尋找希格斯
玻色子衰變至Z玻色子和光子具有相對乾淨的終態，但在很大程度上受到
不可避免的背景p-p→Zγ和可減少的背景Z玻色子及噴流過程的影響。為
增強LHC Run-2數據集的分析，已實施了多種新的分析技術。光子識別在
多變量分析中起著關鍵作用，可減少Z+Jets的貢獻。本研究考慮了來自
H→Zγ的光子和來自Z+Jets的光子的特定變數，使用LHC Run-2 UltraLegacy（UL）模擬數據進行了機器學習。學習結果與CMS-EGM團隊為
Ultra-Legacy的標准光子識別模型進行了比較。預期的中位數顯著性為
1.15σ，表明改進了8.4％。我們的目標是將這一新發展應用於Run-2 UltraLegacy和Run-3分析。 | zh_TW |
| dc.description.abstract | The measurement of the rare decay of the Higgs boson would help understand the
Standard Model(SM) of particle physics and the NLO contribution of H→ll γ final
state. The search for H→Zγ has a relatively clean final state but is significantly contributed by irreducible background SM Zγ and reducible background Z+Jets processes.
To enhance the analysis of the LHC Run-2 dataset, several new analysis techniques
have been implemented. Photon identification plays a crucial role in reducing the
contribution of Z+jets in multivariate analysis. This study considers specific shower
shape and isolation variables of prompt photons from H→Zγ and jet-fake photons
from Z+Jets using LHC Run-2 Ultra-Legacy(UL) simulations. The training results are
compared with standard photon identification trained by CMS-EGM groups for ULtraLegacy. The expected significance is 1.15 σ, indicating an improvement of 8.4%. We aim
to implement this new development for Run-2 Ultra-Legacy and Run-3 analysis. | en_US |
| DC.subject | 希格斯玻色子 | zh_TW |
| DC.subject | 光子 | zh_TW |
| DC.subject | 機器學習 | zh_TW |
| DC.subject | Higgs boson | en_US |
| DC.subject | photon | en_US |
| DC.subject | XGBoost | en_US |
| DC.title | Dedicated photon identification for H ⭢ Zγ with the CMS detector at √ s = 13 TeV | 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 |