CLAS physics database search results Measurement E159M812 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Stat. error deg mcb/rad mcb/rad 30 0.376051 0.0753227 90 0.342265 0.0612737 150 0.413097 0.0905252 210 0.375625 0.0720025 270 0.357316 0.0664358 330 0.405832 0.0817697