CLAS physics database search results Measurement E159M838 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.353846 0.067828 90 0.339373 0.0581525 150 0.390704 0.0649549 210 0.460612 0.0731091 270 0.386606 0.0711943 330 0.385093 0.0669987