Pole structure inference of Λ(1405) via deep learning in the Σ⁰π⁰ invariant mass spectrum
Abstract
Peak structures in invariant mass distributions are often interpreted as genuine hadronic resonances. However, its existence near a hadron-hadron threshold results to ambiguous interpretations such as bound and virtual states as dynamical and kinematical effects come into play. These states can be inferred by studying the pole structure of the S-matrix. In this work, we analyzed one of these enhancements that is the Λ(1405) observed near the K̅N-threshold in the Σ⁰π⁰ invariant mass distribution from CLAS measurements of the γp → K+Σ⁰π⁰ reaction. Using a convolutional neural network, our results show that the Λ(1405) is a two-pole structure of the S-matrix in the second Riemann sheet and can be interpreted as a bound state of K̅ and N.
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Entangled!
25-28 June 2025, National Institute of Physics, University of the Philippines Diliman
Please visit the SPP2025 activity webpage for more information on this year's Physics Congress.