CLAS physics database search results Measurement E159M766 E1-6 V. Burkert 2001 psi(pi+) dsigma/dpsi_pip Data errors deg mcb/rad mcb/rad 30 0.575342 0.0814792 90 0.480785 0.0672387 150 0.54979 0.0781756 210 0.524554 0.076309 270 0.539564 0.0821624 330 0.584613 0.0817439