CLAS physics database search results Measurement E159M623 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.500988 0.0951605 90 0.524256 0.0863159 150 0.589207 0.104943 210 0.563612 0.0995947 270 0.532583 0.0883481 330 0.508281 0.0920582