CLAS physics database search results Measurement E159M650 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.422605 0.0751405 90 0.454064 0.0811332 150 0.504492 0.0920755 210 0.492981 0.0834859 270 0.422627 0.0710234 330 0.416611 0.069417