CLAS physics database search results Measurement E159M27 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.354035 0.0536798 90 0.554211 0.0778814 150 0.53555 0.0752992 210 0.571839 0.0778425 270 0.459303 0.0649942 330 0.398163 0.0597592