CLAS physics database search results Measurement E216M670 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.114898 0.0335408 0.03772325 54 0.0897648 0.0094034 0.01121519 90 0.101491 0.0070603 0.00946052 126 0.116179 0.00646712 0.00882776 162 0.114546 0.00738168 0.00953572 198 0.117862 0.00769695 0.00902353 234 0.125255 0.0111475 0.0114292 270 0.108951 0.0108055 0.00959792 306 0.0726345 0.0152893 0.00821691 342 0.0903502 0.0115386 0.01841685