P Wave Meson Spectrum in a Relativistic Model with Instanton Induced   Interaction
  On the basis of the phenomenological relativistic harmonic models for quarks we have obtained the masses of P wave mesons. The full Hamiltonian used in the investigation has Lorentz scalar + vector confinement potential, along with one gluon exchange potential (OGEP) and the instanton-induced quark-antiquark interaction (III). A good agreement is obtained with the experimental masses. The respective role of III and OGEP for the determination of the meson masses is discussed. 
Bhavyashri, K. B. Vijaya Kumar, Yong-Liang Ma, Antony Prakash