CLAS physics database search results Measurement E159M884 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.071303 0.0207315 90 0.0692058 0.0199005 150 0.0621836 0.0141286 210 0.0731087 0.0205301 270 0.052479 0.0143738 330 0.0479465 0.0153241