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Strong decays of charmed baryons are analyzed in the framework of heavyhadron chiral perturbation theory (HHChPT) in which heavy quark symmetry andchiral symmetry are synthesized. HHChPT works excellently for describing thestrong decays of s-wave charmed baryons. For L=1 orbitally excited states, twoof the unknown couplings, namely, $h_2$ and $h_{10}$, are determined from theresonant $\Lambda_c^+\pi\pi$ mode produced in the $\Lambda_c(2593)$ decay andthe width of $\Sigma_c(2800)$, respectively. Predictions for the strong decaysof the p-wave charmed baryon states $\Lambda_c(2625)$, $\Xi_c(2790)$ and$\Xi_c(2815)$ are presented. Since the decay$\Lambda_c(2593)^+\to\Lambda_c^+\pi\pi$ receives non-resonant contributions,our value for $h_2$ is smaller than the previous estimates. We also discuss thefirst positive-parity excited charmed baryons. We conjecture that the charmedbaryon $\Lambda_c(2880)$ with $J^P=\frac52^+$ is an admixture of$\Lambda_{c2}(\frac52^+)$ with and $\tilde\Lambda''_{c3}(\frac52^+)$; both areL=2 orbitally excited states. The potential model suggests $J^P=\frac52^-$ or$\frac32^+$ for $\Lambda_c(2940)^+$. Measurements of the ratio of$\Sigma_c^*\pi/\Sigma_c\pi$ will enable us to discriminate the $J^P$assignments for $\Lambda_c(2940)$. We advocate that the $J^P$ quantum numbersof $\Xi_c(2980)$ and $\Xi_c(3077)$ are $\frac12^+$ and $\frac52^+$,respectively. Under this $J^P$ assignment, it is ready to understand why$\Xi_c(2980)$ is broader than $\Xi_c(3077)$.Comment: 22 pages, the coupling g_2 is slightly modified, Tables 5 and 6 are  updated; version to appear in PR

Strong decays of charmed baryons in heavy hadron chiral perturbation theory