CLAS physics database search results Measurement E159M433 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.671508 0.100896 90 0.671091 0.105196 150 0.77817 0.11084 210 0.755995 0.107916 270 0.571851 0.0846341 330 0.549923 0.0791963