CLAS physics database search results Measurement E216M229 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.573756 0.0278118 0.05999383 54 0.582031 0.0379983 0.05756398 90 0.61637 0.0436745 0.05607804 126 0.670543 0.0136223 0.0528266 162 0.798561 0.0131764 0.05776019 198 0.818781 0.0130471 0.05836283 234 0.710617 0.016488 0.05476959 270 0.569663 0.0235758 0.04864217 306 0.547508 0.0273599 0.05330493 342 0.566252 0.0321834 0.06992361