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Final state interaction in the Λb→D+D−Λ, D0Ds−p, Ds+Ds−Λ reactions

Jing Song1,2,3,*, Melahat Bayar4,3,†, and Eulogio Oset3,5,‡

  • *Contact author: Song-Jing@buaa.edu.cn
  • †Contact author: melahat.bayar@kocaeli.edu.tr
  • ‡Contact author: oset@ific.uv.es
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Phys. Rev. D 112, 094002 – Published 4 November, 2025

DOI: https://doi.org/10.1103/l4qb-71qx

Abstract

We study the three-body decays Λb→D+D−Λ,D0Ds−p,Ds+Ds−Λ, considering both internal and external emission mechanisms that produce various meson-baryon final states. Using a unitarized coupled-channel approach based on the local hidden gauge formalism, we analyze final state interactions in the exotic anticharm systems with strangeness S=−1 and S=−2. Significant threshold enhancements appear in both pseudoscalar and vector meson-baryon channels, indicating strong final state interactions and the possible formation of molecular exotic states below threshold. These features remain stable under variations of model parameters. Our results provide valuable insights into heavy hadron decay dynamics and offer theoretical guidance for future experimental searches of open-charm strange exotic hadrons. These results take into account the effects of the D+Λ and D+D− interactions, three-body rescattering, possible triangle singularities, parameter uncertainties, and large Nc behavior, making the predictions very reliable.

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Phys. Rev. D 112, 094002– Published 4 November, 2025
  • Received 9 July 2025
  • Accepted 20 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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