CLAS physics database search results Measurement E159M801 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.342289 0.056992 90 0.387807 0.0596391 150 0.444998 0.0692786 210 0.447698 0.0700071 270 0.360799 0.0538123 330 0.380934 0.0621072