CLAS physics database search results Measurement E159M855 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.283241 0.0485755 90 0.28087 0.045588 150 0.36439 0.0583892 210 0.376687 0.0595134 270 0.314969 0.0518532 330 0.305662 0.054818