Tensor forces and relativistic corrections in quarkonium
  The influence of tensor forces on hyperfine splitting and decay widths of mesons are investigated within the limits of quasirelativistic potential quark model. As the starting the system of the Rarita-Schwinger equations is used. We use a potential motivated by QCD with a mixed Lorentz structure. 
I. Haysak (1), V. Morokhovych (1), S. Chalupka (2), M. Salak (3) ((1)   Uzhgorod National University, Uzhgorod, Ukraine, (2)...