CLAS physics database search results Measurement E159M306 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.484894 0.0697226 90 0.625218 0.0843875 150 0.748386 0.100772 210 0.632413 0.0848189 270 0.599178 0.0806628 330 0.485141 0.0693614