CLAS physics database search results Measurement E159M263 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.588367 0.0939948 90 0.488892 0.0762708 150 0.542738 0.0847313 210 0.615357 0.0950782 270 0.556503 0.0825193 330 0.544251 0.0823488