CLAS physics database search results Measurement E216M944 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 0.229938 0.0441524 0.03297874 27 0.232057 0.037922 0.0242406 45 0.321897 0.0238223 0.02669591 63 0.282399 0.0201274 0.02535125 81 0.259774 0.0191942 0.02244423 99 0.273293 0.0344962 0.02589482 117 0.299551 0.0489357 0.03523452 135 0.25943 0.0485783 0.04225386 153 0.154533 0.0149625 0.0650523 171 0.197716 0.00018087 0.10053073