CLAS physics database search results Measurement E159M567 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Stat. error deg mcb/rad mcb/rad 30 0.503649 0.0733578 90 0.581255 0.0835177 150 0.625342 0.0937748 210 0.644738 0.0922174 270 0.578419 0.0832371 330 0.507576 0.0799066