  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
non-relativistic reduction of the Lagrangian is also discussed.

High Energy Physics - Phenomenology