• Accepted Paper

Revisiting the Λ(1405) pole structure with convolutional neural networks

Julius B. Pagayon, Vince Angelo A. Chavez, and Denny Lane B. Sombillo

Phys. Rev. D - Accepted 27 October, 2026

DOI: https://doi.org/10.1103/g1dl-5gbh

Abstract

We revisit the long-standing ambiguity surrounding the complex pole structure of the Λ(1405) resonance by reframing it as a classification problem for convolutional neural networks (CNNs). By training our models to recognize subtle geometric variations in nearly degenerate lineshapes using a targeted differential feature from empirical CLAS data, we establish a data-driven consensus on large inference samples. Our results reveal a robust preference for analytic structures containing two poles on the [bt] sheet, with multi-pole [2bt,1bb,0tb] structure emerging as the dominant pole topology. The inference-guided pole parameter extraction supports a two-state interpretation, characterized by a molecular state manifesting as an isolated pole in the [bt] sheet below the K‾N threshold and a non-molecular state appearing as a pole-shadow pair across the [bt] and [bb] sheets above the Σπ threshold.

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