The chiral effective meson-baryon Lagrangian for the description of interactions between the doubly charmed baryons and Goldstone bosons is constructed up to the order of $q^4$. The numbers of linearly independent invariant monomials of $\mathcal{O}(q^2)$, $\mathcal{O}(q^3)$, and $\mathcal{O}(q^4)$ are 8, 32, and 218, in order. The obtained Lagrangian can be used to study the chiral dynamics and relevant phenomenology of the doubly charmed baryons at complete one-loop level in future. For completeness, the nonrelativistic reduction of the Lagrangian is also discussed.

• Received 26 December 2020
• Accepted 21 January 2021

DOI:https://doi.org/10.1103/PhysRevD.103.034006

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Published by the American Physical Society