CLAS physics database search results Measurement E216M895 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0178367 0.00431419 0.0060536 54 0.0226293 0.00851789 0.00356251 90 0.0320925 0.00698696 0.00468264 126 0.0475362 0.00782174 0.00653261 162 0.0429759 0.00791693 0.00434909 198 0.0400056 0.00772327 0.0054174 234 0.031576 0.00589573 0.00441182 270 0.0424743 0.00720966 0.00526562 306 0.0246615 0.00562661 0.00463742 342 0.0146845 0.00273116 0.00429463