bb positive parity states

  Χb0(2P) - Χb0(1P)     0.373 GeV  
  Χb1(2P) - Χb1(1P)     0.363 GeV  
  Χb2(2P) - Χb2(1P)     0.356 GeV  

spacing somewhat smaller than 380 MeV
perfectly explained by meson loops.