CLAS physics database search results Measurement E216M724 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.135273 0.0132129 0.01364369 54 0.12778 0.00725542 0.01047466 90 0.146796 0.00804751 0.01263429 126 0.147359 0.0155744 0.01356497 162 0.183916 0.00869026 0.01444943 198 0.183367 0.00911487 0.01540448 234 0.164717 0.00721909 0.01272532 270 0.141105 0.0123782 0.01256132 306 0.13605 0.00859637 0.01157119 342 0.145078 0.0125457 0.01978967