Master Thesis Open Access

Deep Continuum Suppression with Predictive Uncertainties at the Belle II Experiment

Sowa, Lars

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    <subfield code="a">Deep Continuum Suppression with Predictive Uncertainties at the Belle II Experiment</subfield>
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    <subfield code="a">&lt;p&gt;The SuperKEKB collider in Japan accelerates&lt;br&gt;
electrons and positrons which collide at an energy of 11 GeV aiming to produce B meson&lt;br&gt;
pairs. To analyse the properties of a B meson, it gets recombined from its decay daughters.&lt;br&gt;
Since there are a lot of background events that mimic the signature of a B meson, it is&lt;br&gt;
important 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&lt;br&gt;
presents a reliable, self-attention-based input mechanism which allows for invariance under&lt;br&gt;
the particle order. Secondly, to guarantee certainty about the prediction of deep learning models, there is a&lt;br&gt;
high interest in models with predictive uncertainties. This is addressed using the concept&lt;br&gt;
of Deep Ensembles to predict uncertainties of continuum classifications.&lt;br&gt;
Finally, the use of vertex information for the training of a model leads to a bias in&lt;br&gt;
certain analysis variables. Since this could lead to falsification of further studies, a Distance&lt;br&gt;
Correlation is used to decorrelate the Continuum Suppression model from third variables.&lt;/p&gt;</subfield>
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    <subfield code="a">Continuum Suppression</subfield>
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Publication date:
July 27, 2021
Keyword(s):
Continuum Suppression Deep Learning Uncertainties Decorrelation Self-Attention
Awarding University:
Karlsruhe Institute of Technology (KIT)
Report Number:
ETP-KA/2021-09
Communities:

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