CLAS physics database search results Measurement E216M959 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0638326 0.00544184 0.00698307 54 0.0628336 0.005874 0.00646872 90 0.0629563 0.00863493 0.00633157 126 0.0973718 0.0117279 0.00825271 162 0.0817579 0.0105352 0.01022938 198 0.0896404 0.00817868 0.0086422 234 0.082103 0.00750179 0.00690053 270 0.065817 0.00701088 0.0067917 306 0.0506566 0.00461009 0.00517407 342 0.0663023 0.00560531 0.00851502