CLAS physics database search results Measurement E159M648 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.432854 0.0686658 90 0.392969 0.060711 150 0.561391 0.085073 210 0.556948 0.085893 270 0.403493 0.062572 330 0.443694 0.0725161