CLAS physics database search results Measurement E159M342 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 1.03533 0.141205 90 1.07697 0.13939 150 1.12742 0.145926 210 1.06649 0.137921 270 1.04404 0.136822 330 1.09585 0.145688