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))

We present QCD corrections to the Drell-Yan process in the transversely polarized, longitudinally polarized, and unpolarized cases. The analytical results are presented in a form valid for all ndimensional regularization schemes. A universal mass factorization scheme is presented in which the results reduce to those of dimensional reduction. The connection between the parton distributions and fragmentation functions of dimensional reduction and those of dimensional regularisation is elucidated in a simple manner.Numerical results are presented for proton-proton collisions at energies relevant to ,the BNL Relativistic Heavy Ion Collider. The perturb&w stability of the transverse and longitudinal asymmetries is investigated.PACS number(s): 12.38. Bx, 13.75.Cs, 13.85.Qk, 13.88.+e

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))

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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Longitudinally polarized, unpolarized and forward-backward mass differential cross sections for Drell-Yan lepton-pair production by arbitrary vector bosons are calculated in next-to-leading order ͑NLO͒ QCD. Analytical results are presented in a form valid for all consistent n-dimensional regularization schemes, with the mass factorization scheme kept general. NLO predictions for all Drell-Yan type processes ͑W Ϯ , Z and ␥*͒ at BNL's Relativistic Heavy Ion Collider ͑RHIC͒ are made using polarized parton distributions which fit the recent deep-inelastic scattering data. These are examined as tools in the determination of the polarized parton distributions and the unpolarized ū/d ratio. NLO predictions for the forward-backward lepton asymmetry at Fermilab are made and the precision determination of sin 2 W from future runs is studied. In all the above, the QCD corrections are found to be significant. An introductory discussion is given of various theoretical issues, such as allowable factorization and regularization schemes, and scale dependences.