First Differential Measurements of Tzq Production and Luminosity Determination Using Z Boson Rates at the Lhc

本論文描述了LHC在精密前沿的兩項開創性測量：首次對Z相關的單頂夸克（tZq）產生進行差分測量，以及首次在CMS中使用Z玻色子產生率進行光度測量。tZq過程僅在2018年觀察到，對於探測頂夸克電弱耦合具有重要意義。這些耦合是新現象在標準模型頂夸克部門發生的自然場所，然而它們是最少被直接探索的。我們必須對敏感分佈的建模和新頂夸克-Z相互作用的理解進行深入研究。本分析在這一長期努力中標誌著一個重要里程碑。使用先進的機器學習技術，對於新現象和/或tZq建模相關的所有分佈進行了全面深入的研究。光度及其不確定性對實驗的每個物理結果都有貢獻。本論文中細緻開發的方法提供了一種補充測量，從而顯著降低了不確定性。

I studied physics at KIT in Karlsruhe, Germany with the main subjects on theoretical particle physics, experimental particle physics, and data analysis. In summer 2017 I joined the CMS experiment to work for my master's thesis project on improvements in deep neural network algorithms for the identification of jets with b quarks. I showed that by using novel machine learning techniques based on domain adaptation the difference between data and simulation can be mitigated. Afterward, I moved to Hamburg where I started my PhD at the DESY research center. My main project was the analysis of proton-proton collision data recorded by the CMS experiment, where I studied the production of a single top quark in association with a Z boson (tZq). During this time, I also co-supervised a graduate student on a related project. Today, I am a level 3 tX convener for CMS and organize by-weekly meetings and support and review analyses from the early stages. As the HepData contact person, I organize thedata preservation of analysis results. In the past and present, I contribute to the CMS experiment in the group responsible for luminosity determination. I developed a novel technique of measuring the luminosity using Z bosons decaying into muons. The approach requires a deep understanding of the reconstruction, identification, triggering, and efficiency determination of munos. The method is also used to validate the luminosity recorded in the just-started LHC Run 3 data acquisition, where I take a supervising role. In my current position as a postdoctoral scientific researcher, I joined the effort for a precision measurement of the W boson mass, a parameter of the standard model that was recently measured with tension to theory predictions. To cope with the demanding conditions for the planned High-Luminosity LHC, new innovative and cutting-edge technology will be needed. In the context of the Phase-2 upgrade of the CMS experiment, I'm performing test measurements of silicon sensors for the new High Granularity Calorimeter (HGCAL).

我在德國卡爾斯魯厄的卡爾斯魯厄理工學院（KIT）學習物理學，主要專攻理論粒子物理學、實驗粒子物理學和數據分析。2017年夏天，我加入了CMS實驗，為我的碩士論文項目在深度神經網絡算法改進方面進行了研究，用於識別帶有b夸克的噴注。我證明了通過使用基於領域適應的新型機器學習技術，可以減輕數據和模擬之間的差異。之後，我搬到了漢堡，在德西研究中心開始攻讀博士學位。我的主要項目是分析CMS實驗記錄的質子-質子碰撞數據，研究單個頂夸克與Z玻色子（tZq）的產生。在此期間，我還共同指導了一位研究生的相關項目。如今，我是CMS的3級tX召集人，組織雙週會議，並支持和審查早期階段的分析工作。作為HepData的聯絡人，我組織分析結果的數據保存工作。過去和現在，我在負責光度確定的小組中為CMS實驗做出貢獻。我開發了一種使用Z玻色子衰變成μ子的方法來測量光度的新技術。這種方法需要對μ子的重建、識別、觸發和效率確定有深入的理解。該方法還用於驗證剛開始的LHC Run 3數據採集中記錄的光度，我在其中擔任監督角色。作為一名博士後科學研究員，我目前參與了W玻色子質量的精密測量工作，這是標準模型的一個參數，最近的測量結果與理論預測存在差異。為了應對計劃中的高光度LHC的苛刻條件，將需要新的創新和尖端技術。在CMS實驗的第二階段升級的背景下，我正在對新的高粒度量能器（HGCAL）的矽傳感器進行測試測量。