CLAS physics database search results Measurement E46M135 N/A 0 cos(theta_HS^pi+) dsigma/dcos(theta_HS^pi+) Data errors dimensionless mcb mcb -0.875 0.640929 0.261709 -0.625 0.275416 0.077734 -0.375 0.288141 0.075637 -0.125 0.221548 0.063015 0.125 0.220498 0.060204