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Adversarially-trained autoencoders for robust unsupervised new physics searches.

Blance, Andrew and Spannowsky, Michael and Waite, Philip (2019) 'Adversarially-trained autoencoders for robust unsupervised new physics searches.', Journal of high energy physics., 2019 (10).


Machine learning techniques in particle physics are most powerful when they are trained directly on data, to avoid sensitivity to theoretical uncertainties or an underlying bias on the expected signal. To be able to train on data in searches for new physics, anomaly detection methods are imperative, which can be realised by an autoencoder acting as an unsupervised classifier. The last source of uncertainties affecting the classifier are then experimental uncertainties in the reconstruction of the final-state objects. To mitigate their effect on the classifier and to allow for a realistic assessment of the method, we propose to combine the autoencoder with an adversarial neural network to remove its sensitivity to the smearing of the final-state objects. We quantify its effect and show that one can achieve a robust anomaly detection in resonance-induced tt¯ final states.

Item Type:Article
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Publisher statement:Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:20 September 2019
Date deposited:18 October 2019
Date of first online publication:04 October 2019
Date first made open access:18 October 2019

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