CLAS physics database search results Measurement E216M953 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 0.275955 0.0503528 0.03810578 27 0.228638 0.0238042 0.01913057 45 0.276142 0.0214432 0.02428833 63 0.244589 0.029199 0.02157913 81 0.231627 0.0392851 0.0247652 99 0.258285 0.0240997 0.02068343 117 0.223756 0.0213218 0.02015905 135 0.205255 0.0279411 0.03478704 153 0.131725 0.0112874 0.05233356 171 0.159948 0.00014873 0.08286362