CLAS physics database search results Measurement E159M478 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.246898 0.0349195 90 0.295634 0.0456985 150 0.58519 0.0908092 210 0.470007 0.0686373 270 0.325943 0.0513171 330 0.328308 0.0529691