CLAS physics database search results Measurement E216M854 CLAS12 Run Group A Krishna Chandra 2018 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 9 0.411386 0.0436764 0.03479216 27 0.385358 0.0227623 0.02960814 45 0.394103 0.02132 0.03199935 63 0.30816 0.0161411 0.02593454 81 0.349409 0.019469 0.02836289 99 0.319466 0.0233325 0.02535877 117 0.286185 0.023703 0.02577742 135 0.191608 0.0378424 0.02385186 153 0.129088 0.0347906 0.03522674 171 0.16419 0.00015939 0.08563333