CLAS physics database search results Measurement E216M566 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 1.00071 0.0650348 0.08268403 27 0.962662 0.0337988 0.07138355 45 0.915736 0.0287917 0.06882436 63 0.916495 0.0264559 0.06922063 81 1.0142 0.0294473 0.07743131 99 1.05327 0.0393474 0.0823318 117 0.934787 0.0455611 0.09524894 135 0.894665 0.0784015 0.14223247 153 0.717358 0.0457899 0.26159436 171 0.814126 0.00238425 0.44382481