CLAS physics database search results Measurement E159M659 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Stat. error deg mcb/rad mcb/rad 30 0.0820557 0.0231576 90 0.0757381 0.0203974 150 0.0804306 0.0234399 210 0.0676476 0.0209615 270 0.0725357 0.0176571 330 0.0502266 0.0133531