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- W2991500343 abstract "We provide a prescription to train optimal machine-learning-based event selectors and categorizers that maximize the statistical significance of a potential signal excess in high energy physics (HEP) experiments, as quantified by any of six different performance measures. For analyses where the signal search is performed in the distribution of some event variables, our prescription ensures that only the information complementary to those event variables is used in event selection and categorization. This eliminates a major misalignment with the physics goals of the analysis (maximizing the significance of an excess) that exists in the training of typical ML-based event selectors and categorizers. In addition, this decorrelation of event selectors from the relevant event variables prevents the background distribution from becoming peaked in the signal region as a result of event selection, thereby ameliorating the challenges imposed on signal searches by systematic uncertainties. Our event selectors (categorizers) use the output of machine-learning-based classifiers as input and apply optimal selection cutoffs (categorization thresholds) that depend on the event variables being analyzed, as opposed to flat cutoffs (thresholds). These optimal cutoffs and thresholds are learned iteratively, using a novel approach with connections to Lloyd's k-means clustering algorithm. We provide a public, Python 3 implementation of our prescription called ThickBrick, along with usage examples." @default.
- W2991500343 created "2019-12-05" @default.
- W2991500343 creator A5016417980 @default.
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- W2991500343 date "2019-11-26" @default.
- W2991500343 modified "2023-09-27" @default.
- W2991500343 title "Optimal event selection and categorization in high energy physics, Part 1: Signal discovery" @default.
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