CLAS physics database search results Measurement E216M431 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 1.1626 0.065652 0.0946991 27 1.04875 0.0437749 0.07972455 45 1.0606 0.028482 0.08273951 63 1.06358 0.0262332 0.07836014 81 1.10538 0.0270848 0.08182445 99 1.14142 0.0357232 0.0850593 117 1.11737 0.0516048 0.12965406 135 1.02819 0.0565203 0.22035726 153 0.820912 0.0260348 0.36867555 171 1.10439 0.0037656 0.61996832