CLAS physics database search results Measurement E159M254 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.479167 0.0808616 90 0.443958 0.0683662 150 0.504077 0.0780275 210 0.504276 0.0778995 270 0.416558 0.066498 330 0.462879 0.072465