CLAS physics database search results Measurement E159M495 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.341841 0.0615437 90 0.302763 0.0447801 150 0.423312 0.0753553 210 0.386116 0.05777 270 0.303409 0.0439798 330 0.273521 0.0424534