CLAS physics database search results Measurement E159M783 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.350889 0.0543143 90 0.411446 0.0601532 150 0.486973 0.0773616 210 0.50746 0.0775761 270 0.421109 0.0640313 330 0.37389 0.0600101