CLAS physics database search results Measurement E216M971 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 0.240522 0.0448148 0.03408857 27 0.310175 0.0329633 0.03097413 45 0.28401 0.0250309 0.02297691 63 0.304867 0.0264605 0.02780844 81 0.307279 0.024947 0.0265467 99 0.274897 0.0217501 0.02389057 117 0.209383 0.0209492 0.02148232 135 0.15482 0.0245795 0.02546235 153 0.0942568 0.0110573 0.03081482 171 0.115697 0.00010979 0.05953589