CLAS physics database search results Measurement E159M819 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.347825 0.0571532 90 0.363873 0.0565954 150 0.431306 0.0675202 210 0.456147 0.0708238 270 0.379878 0.0612077 330 0.327624 0.0527972