CLAS physics database search results Measurement E216M809 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 0.245112 0.0359212 0.02574088 27 0.276419 0.0231918 0.02142084 45 0.295419 0.0198181 0.0231225 63 0.305283 0.0209472 0.0240571 81 0.299292 0.0187891 0.02351266 99 0.29004 0.0207181 0.02478756 117 0.226562 0.0334656 0.02001902 135 0.217031 0.0261891 0.04568542 153 0.158506 0.0149601 0.06828314 171 0.2051 0.00018646 0.11474278