CLAS physics database search results Measurement E159M432 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.635936 0.0951495 90 0.619723 0.0913371 150 0.832678 0.120228 210 0.881002 0.125225 270 0.609901 0.0878887 330 0.587039 0.0853759