Learning new physics efficiently with nonparametric methodsAbstract

TitleLearning new physics efficiently with nonparametric methodsAbstract
Publication TypeJournal Article
Year of Publication2022
AuthorsLetizia, M, Losapio, G, Rando, M, Grosso, G, Wulzer, A, Pierini, M, Zanetti, M, Rosasco, L
JournalThe European Physical Journal C
Date Published10/2022

We present a machine learning approach for model-independent new physics searches. The corresponding algorithm is powered by recent large-scale implementations of kernel methods, nonparametric learning algorithms that can approximate any continuous function given enough data. Based on the original proposal by D’Agnolo and Wulzer (Phys Rev D 99(1):015014, 2019, arXiv:1806.02350 [hep-ph]), the model evaluates the compatibility between experimental data and a reference model, by implementing a hypothesis testing procedure based on the likelihood ratio. Model-independence is enforced by avoiding any prior assumption about the presence or shape of new physics components in the measurements. We show that our approach has dramatic advantages compared to neural network implementations in terms of training times and computational resources, while maintaining comparable performances. In particular, we conduct our tests on higher dimensional datasets, a step forward with respect to previous studies.

Short TitleEur. Phys. J. C

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