Beyond cuts in small signal scenarios
We investigate enhancing the sensitivity of new physics searches at the LHC by machine learning in the case of background dominance and a high degree of overlap between the observables for signal and background. We use two different models, XGBoost and a deep neural network, to exploit correlations...
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| Veröffentlicht in: | The European physical journal. C, Particles and fields Jg. 83; H. 5; S. 379 - 22 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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Heidelberg
Springer
01.05.2023
Springer Nature B.V SpringerOpen |
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| ISSN: | 1434-6044, 1434-6052 |
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| Abstract | We investigate enhancing the sensitivity of new physics searches at the LHC by machine learning in the case of background dominance and a high degree of overlap between the observables for signal and background. We use two different models, XGBoost and a deep neural network, to exploit correlations between observables and compare this approach to the traditional cut-and-count method. We consider different methods to analyze the models' output, finding that a template fit generally performs better than a simple cut. By means of a Shapley decomposition, we gain additional insight into the relationship between event kinematics and the machine learning model output. We consider a supersymmetric scenario with a metastable sneutrino as a concrete example, but the methodology can be applied to a much wider class of models. |
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| AbstractList | We investigate enhancing the sensitivity of new physics searches at the LHC by machine learning in the case of background dominance and a high degree of overlap between the observables for signal and background. We use two different models, XGBoost and a deep neural network, to exploit correlations between observables and compare this approach to the traditional cut-and-count method. We consider different methods to analyze the models’ output, finding that a template fit generally performs better than a simple cut. By means of a Shapley decomposition, we gain additional insight into the relationship between event kinematics and the machine learning model output. We consider a supersymmetric scenario with a metastable sneutrino as a concrete example, but the methodology can be applied to a much wider class of models. Abstract We investigate enhancing the sensitivity of new physics searches at the LHC by machine learning in the case of background dominance and a high degree of overlap between the observables for signal and background. We use two different models, XGBoost and a deep neural network, to exploit correlations between observables and compare this approach to the traditional cut-and-count method. We consider different methods to analyze the models’ output, finding that a template fit generally performs better than a simple cut. By means of a Shapley decomposition, we gain additional insight into the relationship between event kinematics and the machine learning model output. We consider a supersymmetric scenario with a metastable sneutrino as a concrete example, but the methodology can be applied to a much wider class of models. |
| Audience | Academic |
| Author | Strümke, Inga Alvestad, Daniel Maeland, Steffen Kersten, Jörn Fomin, Nikolai |
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| Copyright | COPYRIGHT 2023 Springer The Author(s) 2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. |
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| DOI | 10.1140/epjc/s10052-023-11532-9 |
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| SubjectTerms | Analysis Artificial neural networks Decision trees Kinematics Large Hadron Collider Machine learning Neural networks Physics Sensitivity enhancement |
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| Title | Beyond cuts in small signal scenarios |
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