Final state interaction in the $\Lambda_b\to D^+D^- \Lambda,~D^0D_s^- p,~D_s^+D_s^-\Lambda$ reactions

TL;DR

This paper investigates three-body decays of b1_b to various meson-baryon final states, revealing strong final state interactions and potential exotic molecular states through a unitarized coupled-channel approach.

Contribution

It introduces a unitarized coupled-channel analysis of b1_b decays, highlighting the formation of exotic states and threshold enhancements in strange anticharm systems.

Findings

Threshold enhancements in meson-baryon channels

Evidence for possible molecular exotic states

Stable features under model variations

Abstract

We study the three-body decays \(\Lambda_b \to D^+ D^- \Lambda,~D^0D_s^- p,~D_s^+D_s^-\Lambda\), 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.