CLAS physics database search results Measurement E159M792 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.372813 0.0613025 90 0.417926 0.067707 150 0.480902 0.081471 210 0.465489 0.0721932 270 0.417699 0.0655759 330 0.357246 0.0573602