CLAS physics database search results Measurement E159M290 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.665598 0.108111 90 0.437239 0.0683956 150 0.478877 0.0718731 210 0.432632 0.0681474 270 0.449045 0.0685178 330 0.581279 0.0951457