CLAS physics database search results Measurement E159M353 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.919875 0.135655 90 0.938402 0.134605 150 0.921244 0.133991 210 1.02657 0.151283 270 0.925561 0.135917 330 0.97407 0.145546