Abstract:We demonstrate that triangle singularity (TS) and box singularity (BS) mechanisms can produce unique narrow enhancements at the Λ c D and Λ c D * 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 c D and Λ c D * threshold enhancements can be regarded as a feeddown phenomenon originated from both the heavier pentaquark decays and th… Show more
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