July 27, 2021 Master Thesis Open Access

Sowa, Lars

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    "contributors": [], 
    "creators": [
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        "affiliation": "KIT/ETP", 
        "name": "Sowa, Lars"
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    "description": "<p>The SuperKEKB collider in Japan accelerates<br>\nelectrons and positrons which collide at an energy of 11 GeV aiming to produce B meson<br>\npairs. To analyse the properties of a B meson, it gets recombined from its decay daughters.<br>\nSince there are a lot of background events that mimic the signature of a B meson, it is<br>\nimportant to suppress these events. Such a suppression is called Continuum Suppression. This work aims to further improve the Deep Continuum Suppression, which is perfromed by a Multilayer Perceptron (MLP), by three points: Firstly, an MLP needs a fixed order for input particles. Therefore, this thesis<br>\npresents a reliable, self-attention-based input mechanism which allows for invariance under<br>\nthe particle order. Secondly, to guarantee certainty about the prediction of deep learning models, there is a<br>\nhigh interest in models with predictive uncertainties. This is addressed using the concept<br>\nof Deep Ensembles to predict uncertainties of continuum classifications.<br>\nFinally, the use of vertex information for the training of a model leads to a bias in<br>\ncertain analysis variables. Since this could lead to falsification of further studies, a Distance<br>\nCorrelation is used to decorrelate the Continuum Suppression model from third variables.</p>", 
    "keywords": [
      "Continuum Suppression", 
      "Deep Learning", 
      "Uncertainties", 
      "Decorrelation", 
      "Self-Attention"
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    "language": "eng", 
    "publication_date": "2021-07-27", 
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      "subtype": "master-thesis", 
      "title": "Master Thesis", 
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    "thesis": {
      "report_number": "ETP-KA/2021-09", 
      "supervisors": [
        {
          "affiliation": "KIT/SCC", 
          "name": "Kahn, James"
        }, 
        {
          "affiliation": "KIT/ETP", 
          "name": "Goldenzweig, Pablo"
        }, 
        {
          "affiliation": "KIT/ETP", 
          "name": "Husemann, Ulrich"
        }, 
        {
          "affiliation": "KIT/ETP", 
          "name": "Quast, G\u00fcnter"
        }
      ]
    }, 
    "title": "Deep Continuum Suppression with Predictive Uncertainties at the Belle II Experiment"
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    75
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