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Octet baryon and heavy meson interactions in chiral effective field theory

Bo-Lin HuangBo WangShi-Lin Zhu
Feb 2024
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摘要原文
We calculate the effective potentials of the octet baryon and heavy meson systems using the chiral effective field theory up to the next-to-leading order. We consider the contact terms, one-pseudoscalar-meson and two-pseudoscalar-meson exchange contributions, facilitating a comprehensive analysis of the short-, mid-, and long-range interactions in these systems. The low energy constants (LECs) are correlated with those of the $\bar{N}N$ interaction using a quark-level Lagrangian approach. We also incorporate the decuplet baryon contributions in the loop diagrams. Our research provides new insights into several near-threshold charmed baryons [e.g., $\Lambda_{c}(2940)$, $\Xi_{c}(3055)$, and $\Omega_{c}(3188)$, etc.] around $3$ GeV from the hadronic molecular perspective. We also identify several molecular states, designated as $\Xi_{c}$, within the mass range of $3100-3500$ MeV. Further measurements of their resonance parameters and decay patterns in experiments will help to discriminate the conventional baryon and hadronic molecule explanations for these near-threshold states.
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