CLAS physics database search results Measurement E159M830 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Stat. error deg mcb/rad mcb/rad 30 0.346434 0.0650236 90 0.328826 0.0605471 150 0.407414 0.0768282 210 0.317751 0.0553504 270 0.341327 0.06324 330 0.383317 0.0850881