CLAS physics database search results Measurement E159M324 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.815902 0.105437 90 0.973607 0.124512 150 1.08332 0.138827 210 1.05224 0.137529 270 0.871107 0.110573 330 0.835986 0.112734