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A Deep Learning Framework for Disentangling Triangle Singularity and Pole-Based Enhancements

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arXiv:2403.18265v1 Announce Type: cross
Abstract: Enhancements in the invariant mass distribution or scattering cross-section are usually associated with resonances. However, the nature of exotic signals found near hadron-hadron thresholds remain a puzzle today. In fact, a purely kinematic triangle mechanism is also capable of producing similar structures, but do not correspond to any unstable quantum state. In this paper, we report for the first time, that a deep neural network can be trained to distinguish triangle singularity from pole-based enhancements. We also identify the type of dynamic pole structure that can be misidentified as triangle enhancement. We apply our method to confirm that the $P_\psi^N(4312)^+$ state is not due to a single triangle singularity, and the pole-based interpretation is more favored for this signal. Lastly, we argue how our method can be used as a model-selection framework to help in classifying other exotic hadron candidates.

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