Possible Evidence for a Chiral Particle B_0chi, Scalar Meson in the B   Meson System
  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. 
Daiki Ito (Nihon univ.), Muneyuki Ishida (Tokyo Inst. of Tech.), Shin   Ishida (Nihon univ.), Toshihiko Komada (Nihon univ.)...