CLAS physics database search results Measurement E216M593 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 0.956807 0.0581541 0.0906951 27 0.916057 0.0285867 0.0708754 45 0.845711 0.0226415 0.0642482 63 0.804684 0.0260424 0.06446097 81 0.925765 0.0272309 0.07148693 99 0.897292 0.0266489 0.06647162 117 0.66993 0.0276164 0.05654887 135 0.54281 0.0205846 0.06231696 153 0.427176 0.0390589 0.0950113 171 0.458951 0.0010366 0.2441324