  In the covariant level-classification scheme of hadrons proposed recently,
the existence of "chiral particles", scalar and axial-vector mesons as the
partners of the ground-state pseudo-scalar and vector mesons, respectively,
were predicted in the D meson and B meson systems, realizing a linear
representation of chiral symmetry. In this work we reanalyze the B0 pi mass
spectra through Z0 decays to show a possibility for the scalar B_0chi.
