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We study the nature of the scalar D_0 meson from the viewpoint of chiralsymmetry. With the linear representation of chiral symmetry, we construct the Dpi scattering amplitude satisfying the chiral low-energy theorem, in which theD_0 meson appears as an s-wave resonance. We show that the properties of theD_0 meson can be successfully reproduced as the chiral partner of the D mesoncoupled with the D pi scattering states. At the same time, we find that thespectral function and the pole position of D_0 are not very sensitive to thereduction of the chiral condensate, indicating the importance of the dressingof the bare state by the D pi molecular component.

Nature of the D_0 meson in the D pi scattering with chiral symmetry