CLAS physics database search results Measurement E216M818 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 0.354717 0.0467449 0.03262697 27 0.373931 0.0319776 0.03107707 45 0.36177 0.0213309 0.03102001 63 0.369444 0.0187413 0.02945551 81 0.373658 0.0222329 0.03069822 99 0.376889 0.0539379 0.03507417 117 0.343232 0.0242675 0.03099014 135 0.265195 0.0234597 0.04376429 153 0.26224 0.0318755 0.0877526 171 0.250536 0.00022994 0.13468027