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We perform an analysis of QCD lattice data on charmed meson masses. Thequark-mass dependence of the data set is used to gain information on the sizeof counter terms of the chiral Lagrangian formulated with open-charm stateswith J^P= 0^- and J^P =1^- quantum numbers. Of particular interest are thosecounter terms that are active in the exotic flavour sextet channel. A chiralexpansion scheme where physical masses enter the extrapolation formulae isdeveloped and applied to the lattice data set. Good convergence properties aredemonstrated and an accurate reproduction of the lattice data based onensembles of PACS-CS, MILC, ETMC and HSC with pion and kaon masses smaller than600 MeV is achieved. It is argued that a unique set of low-energy parameters isobtainable only if additional information from HSC on some scatteringobservables is included in our global fits. The elastic and inelastic s-wave piD and eta D scattering as considered by HSC is reproduced faithfully. Based onsuch low-energy parameters we predict 15 phase shifts and in-elasticities atphysical quark masses but also for an additional HSC ensemble at smaller pionmass. In addition we find a clear signal for a member of the exotic flavoursextet states in the eta D channel, below the bar K D_s threshold. For theisospin violating strong decay width of the D_{s0}(2317) we obtain the range(104-116) keV.

On chiral extrapolations of charmed meson masses and coupled-channel reaction dynamics