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The cross section for massive fermion production in two-photon collisions wasexamined at next-to-leading order in QCD/QED for general photon helicity. Thedelta function (virtual+soft) part of the differential cross section wasanalytically integrated over the final state phase space. Series expansions forthe complete differential and total cross sections were given up to tenth orderin the parameter beta. These were shown to be of practical use and revealedmuch structure. Accurate parametrizations of the total cross sections weregiven, valid up to higher energies. The above results were applied to top quarkproduction in the region not too far above threshold. The cross section wasshown to be quite sensitive to alpha_s in the appropriate energy region.Comment: 17 pages, includes figures, revtex. Final version to appear in Phys.  Rev. D, two paragraphs of discussion adde

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

Analytically expanded and integrated results for massive fermion production in two-photon collisions and a high precision<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>α</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>determination

Analytically expanded and integrated results for massive fermion production in two-photon collisions and a high precisionαsdetermination