CLAS physics database search results Measurement E159M198 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.92004 0.133433 90 0.958987 0.138301 150 1.31825 0.187301 210 1.22479 0.17465 270 0.990809 0.142891 330 0.931697 0.133911