High spin particles with spin-mass coupling
  The classical and quantum model of high spin particles is proposed and analyzed in this paper. The covariant quantization leads to the spectrum of the particles with the masses correlated with their spins. The particles (and anti-particles) appear to be orphaned as their potential anti-particle partners are of different mass. 
Marcin Daszkiewicz (IFT UWr), Zbigniew Hasiewicz (IFT UwB), Cezary J.   Walczyk (IFT UwB)