CLAS physics database search results Measurement E216M863 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 0.279386 0.0599754 0.03025601 27 0.319738 0.0268077 0.02813804 45 0.372483 0.0194237 0.03047916 63 0.362544 0.0188129 0.02825055 81 0.30227 0.0161239 0.02875558 99 0.296925 0.0208717 0.02281639 117 0.188264 0.0489298 0.0248045 135 0.176997 0.0149778 0.02014097 153 0.160728 0.0171221 0.0327261 171 0.150133 0.00015598 0.08372383