Complete analytical results for the production of heavy-quark pairs by polarized and unpolarized photons in next-to-leading order are presented. Two-, three-and two plus three-jet cross sections for total photon spin J z = 0, ±2 are presented for bb(g) production. The 2-jet cross sections are considered as a background to γγ → H * → bb (standard model). Top production, not too far above threshold, is also considered for J z = 0, ±2. For both band t-quark production, the higher order QCD corrections are found to be significant. (Phys. Rev. D 51, 4808 (1995))
Complete analytical results for the production of heavy-quark pairs by polarized and unpolarized photons in next-to-leading order are presented. Two-, three-and two plus three-jet cross sections for total photon spin J z = 0, ±2 are presented for bb(g) production. The 2-jet cross sections are considered as a background to γγ → H * → bb (standard model). Top production, not too far above threshold, is also considered for J z = 0, ±2. For both band t-quark production, the higher order QCD corrections are found to be significant. (Phys. Rev. D 51, 4808 (1995))
A complete next-to-leading order calculation of longitudinally polarized heavy quark photoproduction is presented. All results of the purturbative calculation are given in detail. For reactions and energies of interest cross sections differential in the transverse momentum and rapidity of the heavy quark, total cross sections and the corresponding asymmetries are given. Errors in the asymmetries are estimated and the possibility to distinguish between various scerarios of the polarized gluon distribution is discussed. Our results are compared with other related publications.
For large-p, direct photon production by a longitudinally polarized beam and target complete nextto-leading-order corrections [higher-order corrections (HOC's)] are determined. For these, one loop corrections to the basic subprocesses g'q-yq and a$-yg, as well as the contributions of g'g'+yqij and yqq, are calculated. For p'p'y f X , K factors greater than unity and polarized cross sections and asymmetries well measurable are obtained. Certain differences in the regularization procedures and the question of dominance of HOC's by soft, collinear, and virtual gluons are also discussed.PACS number(s): 13.85. Qk, 12.38.Bx, 13.88. +e
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