CLAS physics database search results Measurement E159M72 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.477451 0.0686988 90 0.67342 0.0929893 150 0.742504 0.0993862 210 0.755666 0.102674 270 0.653277 0.0892324 330 0.48924 0.0712626