Predictions for feed-down enhancements at the Λ_c D and Λ_c D^* thresholds via the triangle and box singularities

2023/03/23 by Ming-Xiao Duan, Duan, Ming-Xiao, Lin Qiu +4
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2303.13329

openalex publication_date 2023/03/23 · openalex created_date 2023/03/25 · openalex updated_date 2026/07/28

Abstract

We demonstrate that triangle singularity (TS) and box singularity (BS) mechanisms can produce unique narrow enhancements at the Λ_cD and Λ_cD^* thresholds in the invariant mass spectra of J/ψp and J/ψpπ, respectively. Taking into account that such mechanisms only depend on the initial Σ_c^(*)D^(*) interactions near threshold within the TS or BS kinematic regimes, the Λ_cD and Λ_cD^* threshold enhancements can be regarded as a feed-down phenomenon originated from both the heavier pentaquark decays and the Σ_c^(*)D^(*) scatterings from the continuum. A search for these structures in the J/ψp and J/ψpπ spectra in both exclusive and semi-inclusive processes will provide a smoking-gun evidence for the hadronic molecule nature of those observed pentaquarks and clarify the role played by the TS and BS in the near-threshold dynamics.

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