CLAS physics database search results Measurement E159M576 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.405331 0.0622043 90 0.486619 0.0733641 150 0.545553 0.0835489 210 0.541976 0.0801462 270 0.54907 0.0808494 330 0.482424 0.0714459