CLAS physics database search results Measurement E159M937 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.0865535 0.0204416 90 0.0867438 0.0176192 150 0.12417 0.0229235 210 0.143771 0.0317723 270 0.128576 0.0253827 330 0.0699102 0.0174588