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We show that the Sudakov factor from the resummation of double logarithms$\ln(s/k_T^2)$ contained in the distribution functions is responsible for the$k_T$ smearing mechanism employed in the next-to-leading-order QCD($\alpha\alpha_s^2$) calculations of direct photon production. $s$ is thecenter-of-mass energy, and $k_T$ the transverse momentum carried by a parton ina colliding hadron. This factor exhibits the appropriate $s$-dependent Gaussianwidth in $k_T$, such that our predictions are in good agreement withexperimental data.Comment: 12 pages, latex, 6 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Origin of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>k</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>smearing in direct photon production

Origin of thekTsmearing in direct photon production