We present a measurement of the Z boson forwardbackward asymmetry of the process ppbar > &gamma*/Z + X > e+e + X, in the region where the dielectron invariant mass is larger than 50 GeV/c^2. The measurement uses 4.1/fb of CDF Run II data. The method of matrix inversion is used to correct for the distortion in the measurement caused by the detector resolution and photon radiation in the final state. The measurement is compared with PYTHIA v6.216 and it agrees well with PYTHIA prediction. 
Variable  Central  Plug 
Fiducial  Track Fiduciality  1.2 < eta < 2.8 
E_{T}  > 25 GeV for CC (> 20 GeV for CP)  > 20 GeV 
Track Z_{0}  <= 60 cm  <= 60 cm 
P_{T}  > 10 GeV  N/A 
E_{had}/E_{em}  <= 0.055 + 0.00045 * E  <= 0.05 
Isolation(GeV)  <= 3 + 0.02 E_{T}  <= 1.6 + 0.02 E_{T} 
E/p  <= 2.0 or P_{T}(Track) > 50 GeV  N/A 
Q*(delta X)  3.0 cm < Q*(delta X) < 1.5 cm  N/A 
delta Z  < 3 cm  N/A 
L_{shr}  < 0.2  N/A 
PEM chi2 3x3  N/A  10 
Charge 
Opposite charge for CC events. For the CP events, plug electron charge is assumed to be the opposite to the central electron. 

M_{ee}  > 50 GeV 
Dielectron invariant mass distribution .gif 

Response matrix .gif  
Pseudo experiments result. The blue points are A_{FB} in the reconstructed level and the red points are the unfolded A_{FB}. The band corresponds to the statistical uncertainty of 4.1/fb data. .gif 

A_{FB} in the reconstructed level. Only statistical errors are considered. The measurement is compared with PYTHIA v6.216 .gif 

Unfolded A_{FB}. The blue line corresponds to the statistical error. The red line corresponds to the statistical+systematic error. The measurement is compared with PYTHIA v6.216. .gif 