CLAS physics database search results Measurement E159M757 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.370566 0.0522782 90 0.345755 0.0502816 150 0.407683 0.0604872 210 0.431316 0.0627351 270 0.343924 0.0511843 330 0.401186 0.0607373