We report on the first measurement of the angular distributions of final state electrons in pp ! =Z !
eþe þ X events produced in the Z boson mass region at
¼ 1:96 TeV. The data sample collected by
the CDF II detector for this result corresponds to 2:1 fb1 of integrated luminosity. The angular
distributions are studied as a function of the transverse momentum of the electron-positron pair and
show good agreement with the Lam-Tung relation,