CLAS physics database search results Measurement E159M928 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.0709631 0.016882 90 0.0826179 0.0224773 150 0.127346 0.0228302 210 0.17569 0.0334527 270 0.0921138 0.0204727 330 0.0818698 0.0194275