CLAS physics database search results Measurement E159M279 E1-6 V. Burkert 2001 psi(pi-) dsigma/dpsi_pim Data errors deg mcb/rad mcb/rad 30 0.357086 0.0498382 90 0.546731 0.072067 150 0.578513 0.0768725 210 0.559666 0.0744261 270 0.536325 0.0708508 330 0.382009 0.05439