CLAS physics database search results Measurement E159M99 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.725072 0.10203 90 0.932516 0.124752 150 1.14887 0.151886 210 1.05972 0.141052 270 0.848513 0.112978 330 0.761755 0.106576