CLAS physics database search results Measurement E216M494 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 1.64858 0.0669936 0.13945186 27 1.38944 0.036849 0.11119026 45 1.14522 0.0243931 0.08780929 63 1.08524 0.0289302 0.08214347 81 1.09803 0.0355237 0.07985549 99 1.08022 0.0280181 0.07729845 117 1.03157 0.0307613 0.07194906 135 0.806761 0.0434175 0.07635491 153 0.837378 0.0518067 0.1373257 171 0.763501 0.00273804 0.40053075