Covariant L-S Scheme for the effective N*NM couplings
  For excited nucleon states $N^*$ of arbitrary spin coupling to nucleon (N) and meson (M), we propose a Lorentz covariant orbital-spin (L-S) scheme for the effective $N^*NM$ couplings. To be used for the partial wave analysis of various $N^*$ production and decay processes, it combines merits of two conventional schemes, {\sl i.e.}, covariant effective Lagrangian approach and multipole analysis with amplitudes expanded according to angular momentum L. As examples, explicit formulae are given for $N^*\to N\pi$, $N^*\to N\omega$ and $\psi\to N^*\bar N$ processes which are under current experimental studies. 
B. S. Zou (Institute of High Energy Physics, CAS, Beijing, China) and   F. Hussain (Abdus Salam International Centre for The...