  Recently we have proposed a new level-classification scheme of hadrons with a
manifestly covariant framework. In this scheme the requirement of chiral
symmetry on the light quark leads to a prediction of existence of new type of
scalars X_B, X_D and axial-vectors X_B^*,X_D^* as the chiral partners of ground
state pseudoscalar B,D and vector B^*,D^* mesons, respectively. They belong to
``relativistic S-wave states,'' and are discriminated from the conventional
P-wave mesons with j_q=1/2 appearing in the heavy quark effective theory. In
this talk we examine the properties of these chiral mesons: The mass-splittings
between the respective chiral partners are predicted to be equal, and the decay
widths of one pion emission of X_B, X_D, X_B^* and X_D^* are to take the same
value due to both chiral and heavy quark symmetries. Some experimental
indications for existence of X_B and X_D^* are also given, which are consistent
with the above prediction.
