CLAS physics database search results Measurement E159M262 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.393585 0.0522102 90 0.452955 0.0605636 150 0.693025 0.0929807 210 0.738477 0.0972029 270 0.549606 0.0731733 330 0.395989 0.0528355