We report a measurement of the differential cross section,
dsigma/d(cos theta_t), for top-quark-pair production as a function of the
top-quark production angle in proton-antiproton collisions at sqrt (s) =
1.96TeV. This measurement is performed using data collected with the CDF
II detector at the Tevatron, corresponding to an integrated luminosity of
9.4 fb-1. We employ the Legendre polynomials to characterize the shape
of the differential cross section at the parton level. The observed
Legendre coefficients are in good agreement with the prediction of the
next-to-leading-order standard-model calculation, 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.
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Updated: Tuesday, 2013 June 18 16:33:05 CDT automatically from input from Barbara Hehner