We report on the first measurement of the angular distributions
of final state electrons in p anti-p --> gamma*/Z --> e+e- + X
events produced in the Z boson mass region at s**(1/2) ñ.96 TeV. The data
sample collected by the CDF II detector for this result corresponds to
2.1 fb-1 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, consistent with a
spi+n-1 description of the gluon, and demonstrate that at high values
of the transverse momentum, Z bosons are produced via quark anti-quark
annihilation and quark-gluon Compton processes.
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Updated: Monday, 2011 September 19 09:45:27 CDT automatically from input from "Carol Picciolo"