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We report a measurement of the differential cross section, d{\sigma}/d(cos{\theta}t), for top-quark-pair production as a function of the top-quarkproduction angle in proton-antiproton collisions at sqrt{s} = 1.96 TeV. Thismeasurement is performed using data collected with the CDF II detector at theTevatron, corresponding to an integrated luminosity of 9.4/fb. We employ theLegendre polynomials to characterize the shape of the differential crosssection at the parton level. The observed Legendre coefficients are in goodagreement with the prediction of the next-to-leading-order standard-modelcalculation, with the exception of an excess linear-term coefficient, a1 = 0.40+- 0.12, compared to the standard-model prediction of a1 =0.15^{+0.07}_{-0.03}.

Measurement of the Differential Cross Section d{\sigma}/d(cos {\theta}t) for Top-Quark Pair Production in p-pbar Collisions at sqrt{s} = 1.96 TeV