Papers › Signal mixture estimation for degenerate heavy Higgses using a deep neural network

Signal mixture estimation for degenerate heavy Higgses using a deep neural network

20 Apr 2018arXiv:1804.07737links table onlyarchive 2025-07-28

Anders Kvellestad, Steffen Maeland, Inga Strümke

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If a new signal is established in future LHC data, a next question will be to determine the signal composition, in particular whether the signal is due to multiple near-degenerate states. We investigate the performance of a deep learning approach to signal mixture estimation for the challenging scenario of a ditau signal coming from a pair of degenerate Higgs bosons of opposite CP charge. This constitutes a parameter estimation problem for a mixture model with highly overlapping features. We use an unbinned maximum likelihood fit to a neural network output, and compare the results to mixture estimation via a fit to a single kinematic variable. For our benchmark scenarios we find a ~20% improvement in the estimate uncertainty.

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