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Fast and improved neutrino reconstruction in multineutrino final states with conditional normalizing flows

Published inPhysical review. D, vol. 109, no. 1, 012005
Publication date2024-01-11
First online date2024-01-11
Abstract

In this work we introduce 𝜈2-flows, an extension of the 𝜈-flows method to final states containing multiple neutrinos. The architecture can natively scale for all combinations of object types and multiplicities in the final state for any desired neutrino multiplicities. In 𝑡⁢¯𝑡 dilepton events, the momenta of both neutrinos and correlations between them are reconstructed more accurately than when using the most popular standard analytical techniques, and solutions are found for all events. Inference time is significantly faster than competing methods, and can be reduced further by evaluating in parallel on graphics processing units. We apply 𝜈2-flows to 𝑡⁢¯𝑡 dilepton events and show that the per-bin uncertainties in unfolded distributions is much closer to the limit of performance set by perfect neutrino reconstruction than standard techniques. For the chosen double differential observables 𝜈2-flows results in improved statistical precision for each bin by a factor of 1.5 to 2 in comparison to the neutrino weighting method and up to a factor of four in comparison to the ellipse approach.

Citation (ISO format)
RAINE, Johnny et al. Fast and improved neutrino reconstruction in multineutrino final states with conditional normalizing flows. In: Physical review. D, 2024, vol. 109, n° 1, p. 012005. doi: 10.1103/physrevd.109.012005
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Additional URL for this publicationhttps://link.aps.org/doi/10.1103/PhysRevD.109.012005
Journal ISSN2470-0010
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