Molecular charmed baryons and pentaquarks from light-meson exchange saturation

Abstract

The spectrum of the $cqq$ baryons contains a few states whose nature is not clearly a three-quark composite and which might have a sizable baryon-meson component. Examples include the ${\Sigma }_c(2800)$ or the ${\Lambda }_c(2940)$. Here we explore the spectrum of two-body systems composed of a light, octet baryon and a charmed meson (or antimeson) within a simple contact-range theory in which the couplings are saturated by light-meson exchanges. This results in the prediction of a series of composite anticharmed pentaquarks ($\bar{c}qqqq$) and singly-charmed baryons ($c\bar{q}qqq$). Among the later we find $J=\frac{1}{2}$ $\Xi D$ and $J=\frac{3}{2}$ $\Xi D^{\ast }$ bound states with masses matching those of the recently observed ${\Omega }_c(3185)$ and ${\Omega }_c(3327)$ baryons.

14 pages, 6 tables, corresponds to published version

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Cited by in corpus (7)

• Spectrum of the molecular pentaquarks
• Unveiling the Composition of the Single-Charm Molecular Pentaquarks: Insights from Radiative Decay and Magnetic Moment
• Octet baryon and heavy meson interactions in chiral effective field theory
• Mass spectrum and magnetic moments of singly-charmed baryons: a quark-diquark model analysis of ${\Omega }_c(3185{)}^0$ and ${\Omega }_c(3327{)}^0$
• Low-energy $N\varphi$ scattering from a pole-enhanced triangle diagram
• Electromagnetic probes revealing the inner structure of the ${\Lambda }_c(2940)$
• Decoding the near-threshold $X_{0,1}(4140)$ and $X_1(4685)$ states via OZI-suppressed coupled-channel scattering