CLAS physics database search results Measurement E216M401 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.174871 0.0121391 0.02444753 54 0.173946 0.00824731 0.02176633 90 0.168878 0.00807111 0.02391188 126 0.233743 0.0144771 0.03145524 162 0.295674 0.0142714 0.03545757 198 0.280851 0.00993274 0.03562815 234 0.212827 0.0175234 0.02924383 270 0.183798 0.0084258 0.02418583 306 0.169681 0.00788604 0.02138037 342 0.165852 0.009231 0.02240606