CLAS physics database search results Measurement E159M749 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.373317 0.0689968 90 0.324995 0.0636761 150 0.384975 0.0866254 210 0.3041 0.0529387 270 0.293733 0.0520756 330 0.391238 0.0718912