CLAS physics database search results Measurement E159M243 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.245892 0.0345955 90 0.334507 0.0442246 150 0.426323 0.0584697 210 0.419462 0.055787 270 0.38072 0.0488391 330 0.234989 0.0322141