CLAS physics database search results Measurement E159M821 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Stat. error deg mcb/rad mcb/rad 30 0.414066 0.0786871 90 0.385389 0.0644538 150 0.405202 0.0762518 210 0.42537 0.0817888 270 0.415939 0.0783842 330 0.391554 0.0760396