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We study the masses of the low-lying charmed mesons within the framework ofheavy-hadron chiral perturbation theory. We work to third order in the chiralexpansion, where meson loops contribute. In contrast to previous approaches, weuse physical meson masses in evaluating these loops. This ensures that theirimaginary parts are consistent with the observed widths of the D-mesons. Thelowest odd- and even-parity, strange and nonstrange mesons provide enoughconstraints to determine only certain linear combinations of the low-energyconstants in the effective Lagrangian. We comment on how lattice QCD couldprovide further information to disentangle these constants.

Odd- and even-parity charmed mesons revisited in heavy hadron chiral perturbation theory