CLAS physics database search results Measurement E216M887 CLAS12 Run Group A Krishna Chandra 2018 psi(pi+) dsigma/dpsi_pip Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.020982 0.00493451 0.00352669 54 0.0163158 0.00427793 0.00301378 90 0.02047 0.00510389 0.00350628 126 0.0240224 0.0110806 0.00671807 162 0.0264054 0.00672543 0.00773864 198 0.0281212 0.00720791 0.0050884 234 0.0138242 0.00460075 0.00333416 270 0.0123213 0.00475512 0.00242753 306 0.0166188 0.00492381 0.00307429 342 0.0153513 0.00434835 0.00310336