CLAS physics database search results Measurement E159M658 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.0778848 0.016745 90 0.0761211 0.016621 150 0.0864203 0.0159853 210 0.0780656 0.0146656 270 0.0614481 0.0116874 330 0.0503341 0.0111172