CLAS physics database search results Measurement E159M497 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.433515 0.0860677 90 0.319249 0.0599735 150 0.320677 0.0629707 210 0.308914 0.0672195 270 0.279414 0.0504361 330 0.381769 0.0662929