Comparison of cross section results using pwba at Q2 = 5 /fm2
target densities are determined by a comparison to Otterman's calculation (Ott) or by the target gauges (g)
(modified Aug. 9, 2000)
run # Ee MeV theta_e  deg <sig_exp>  cm2/sr <sig_mott> <sig_exp>/<sig_mott>
2528 644 41.20 1.95e-32 (ott) 2.699e-30 7.12e-3
2575 644 41.20 1.92e-32 (ott) 2.699e-30 7.12e-3
1389 841.7 31.03 3.89e-32 (ott) 5.07e-30 7.67e-3
2601 1257 20.56 8.48e-32 (ott) 1.208e-29 7.02e-3
3034 1257 20.57 8.87e-32 (ott) 1.208e-29 7.34e-3
2085 1956 13.05 2.28e-31 (g) 3.088e-29 7.38e-3

Assuming sigma = sigma_mott*|F|2 ,  <|F|2| = 7.28(0.24)e-3, i.e., 3.3% standard deviation

A comparison at Q2 = 19 is underway. This factorization does not seem to work well from the preliminary data. For example,
 
run# E Q2 <sig_exp>/<sig_mott>
1413 + 841.7 19.38 2.14e-5
2630 + 1257 19.06 1.20e-5
1543 + 4032 19.32 to be done