CLAS physics database search results Measurement E159M308 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.576412 0.0871526 90 0.517506 0.0771973 150 0.53682 0.0843945 210 0.611833 0.0940916 270 0.543696 0.0852287 330 0.724755 0.116088