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We study the contributions of the neutral pseudo Goldstone bosons(technipions and top-pions) to the t anti-t production cross sections at theTevatron and the LHC in topcolor-assisted multiscale technicolor (TOPCMTC)models via the gluon-gluon fusion process from the loop-level couplings betweenthe pseudo Goldstone bosons and the gluons. The MRS set A' parton distributionsare used in the calculation. It is shown that the new CDF datum on the t anti-tproduction cross section gives constraints on the parameters in the TOPCMTCmodels. With reasonable values of the parameters in TOPCMTC models, the crosssection at the Tevatron is larger than that predicted by the standard model,and is consistent with the new CDF data. The enhancement of the cross sectionand the resonance peaks at the LHC are more significant, so that it is testablein future experiments.Comment: 16 pages in RevTex, 9 postscript figure

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

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>production rates at the Fermilab Tevatron and the CERN LHC in top-color-assisted multiscale technicolor models

tt¯production rates at the Fermilab Tevatron and the CERN LHC in top-color-assisted multiscale technicolor models