NLO Calculations for Charm Production in DIS

I present a short overview of the NLO QCD calculations available for deep-inelastic production of heavy quarks.Comment: 3 pages. Talk given at UK Phenomenology Workshop on Collider Physics, Durham, England, 19-24 Sep 199

Top quark in theory

I review how the top quark is embedded in the Standard Model and some its proposed extensions, and how it manifests itself in various hadron collider signals.Comment: 12 page

Current Issues in Prompt Photon Production

We give a brief account of recent theoretical developments in prompt photon production.Comment: Contribution to the proceedings of the ``8th International Workshop on Deep-Inelastic Scattering'' (DIS2000), April 2000, Liverpool, UK; 7 Pages, LaTeX, three figures as eps file

Combined recoil and threshold resummation for hard scattering cross sections

We discuss the simultaneous resummation of threshold and recoil enhancements to partonic cross sections due to soft radiation. Our method is based on a refactorization of the parton cross section near its partonic threshold. It avoids double counting, conserves the flow of partonic energy, and reproduces either threshold or recoil resummation when the other enhancements are neglected.Comment: 4 pages, LaTeX, 2 figs. Contributed to 30th International Conference on High-Energy Physics (ICHEP 2000), Osaka, Japan, 27 Jul - 2 Aug 200

Higher-Order QCD Corrections in Prompt Photon Production

We exhibit a method for simultaneously treating recoil and threshold corrections in single-photon inclusive cross sections, working within the formalism of collinear factorization. This approach conserves both the energy and transverse momentum of resummed radiation. At moderate p_T, we find the potential for substantial enhancements from higher-order perturbative and power-law nonperturbative corrections.Comment: 9 Pages, LaTeX, two figures as eps file

D* Production in Two-Photon Collisions

We calculate total and differential production rates of D* mesons in two-photon collisions at LEP2. We include full next-to-leading order QCD corrections, and perform an extensive study of the sensitivity of our predictions to variations of the renormalization scale, charm mass, photonic parton distribution set and fragmentation function. The results are compared with recent data from LEP2.Comment: Latex, 19 pages, 9 figure

Power corrections in eikonal cross sections

We discuss power corrections associated with the infrared behavior of the perturbative running coupling in the eikonal approximation to Drell-Yan and other annihilation cross sections in hadron-hadron scattering. General properties of the eikonal approximation imply that only even powers of the energy scale are necessary.Comment: 4 pages, LaTeX. Contributed to 30th International Conference on High-Energy Physics (ICHEP 2000), Osaka, Japan, 27 Jul - 2 Aug 200

Position-space cuts for Wilson line correlators

We further develop the formalism for taking position-space cuts of eikonal diagrams introduced in [Phys.Rev.Lett. 114 (2015), no. 18 181602, arXiv:1410.5681]. These cuts are applied directly to the position-space representation of any such diagram and compute its discontinuity to the leading order in the dimensional regulator. We provide algorithms for computing the position-space cuts and apply them to several two- and three-loop eikonal diagrams, finding agreement with results previously obtained in the literature. We discuss a non-trivial interplay between the cutting prescription and non-Abelian exponentiation. We furthermore discuss the relation of the imaginary part of the cusp anomalous dimension to the static interquark potential.Comment: 39+18 pages, 16 figures; elaborated the discussion of the comparison of numerical and analytic results for the three-gluon vertex diagram in the caption of fig. 16; version to be published in JHE