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    • A search for the B 0 → D + s D − s decay using multivariate techniques at LHCb Master Thesis

    arXiv · Experiment（2018）

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    Abstract
    A search for the decay B → D s D− s is conducted using the 3 fb−1 of Run 1 data collected by the LHCb experiment. The use of new DNN classifiers recently added to TMVA is investigated in the selection process. A small excess of 2 sigma is measured in the signal region. The use of Run 2 data was envisaged, but the changes in the dataflow and the absence of Run 2 MC did not allow a precise efficiency calculation on the Run 1+Run 2 data. The measured branching fraction using the LHCb Run 1 data is: B(B → D s D− s ) = [6.64± 2.15 (stat)± 2.62 (syst)± 0.76 (norm) ] · 10−5 This is in agreement with previous limits and compatible with the SM prediction.
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    • Pretraining has recently greatly promoted the development of natural language processing (NLP)
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    【要点】：本文通过XENON1T和XENONnT实验研究了Xe-124的双重弱衰变和Xe-136的无中微子双电子捕获，提出了有关其半衰期的新测量结果，并预测了XENONnT实验的未来灵敏度。
    

    【方法】：利用XENON1T和XENONnT实验的数据，对Xe-124的双重电子捕获衰变和Xe-136的无中微子双电子捕获衰变进行了分析和测量。
    

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