Scalar and Pseudo-Scalar Higgs Production at Hadron Colliders

The evaluation of the NNLO QCD corrections to the production of a scalar and a pseudo-scalar Higgs boson is described.Comment: 5+2 pages, 4 figures (9 ps-files). Talk given at RADCOR/Loops and Legs 2002, September 8-13, 2002, Kloster Banz, German

Supersymmetric Higgs production at the Large Hadron Collider

We review the status of theoretical predictions for the production of neutral Higgs bosons at the LHC. Special emphasis is put on the role of bottom quarks in the gluon fusion process and in the associated production of Higgs bosons with bb-bar pairs.Comment: LaTeX, 3 pages, 9 PostScript files included. Talk given at the HEP2003 Europhysics Conference in Aachen, Germany (EPS 2003), July 17-23, 200

Higgs production in heavy quark annihilation through next-to-next-to-leading order QCD

The total inclusive cross section for charged and neutral Higgs production in heavy-quark annihilation is presented through NNLO QCD. It is shown that, aside from an overall factor, the partonic cross section is independent of the initial-state quark flavors, and that any interference terms involving two different Yukawa couplings vanish. A simple criterion for defining the central renormalization and factorization scale is proposed. Its application to the $b\bar bH$ process yields results which are compatible with the values usually adopted for this process. Remarkably, we find little variation in these values for the other initial-state quark flavors. Finally, we disentangle the impact of the different parton luminosities from genuine hard NNLO effects and find that, for the central scales, a naive rescaling by the parton luminosities approximates the full result remarkably well.Comment: 21 pages, 7 figures, 1 table. Matches published versio

Techniques for NNLO Higgs production in the Standard Model and the MSSM

New techniques developed in connection with the NNLO corrections to the Higgs production rate at hadron colliders and some recent applications are reviewed.Comment: 4 pages, LaTeX, 4 ps-files included. Talk presented at the XXXVIIIth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Les Arcs, France, March 22-29, 200

Heavy top limit and double-logarithmic contributions to Higgs production at m_H^2 / s << 1

Next-to-next-to-leading order (NNLO) QCD corrections to Higgs boson hadroproduction have recently been calculated in the heavy top-quark limit m_t -> \infty. The m_t -> \infty limit introduces double-logarithmic corrections in ln x, with x = m_H^2 / s. We identify these corrections order by order in alpha_s. As an application, we derive an analytic expression for the dominant x << 1 part of the NNLO coefficient.Comment: 7 page

Aspherical Word Labeled Oriented Graphs and Cyclically Presented Groups

A {\em word labeled oriented graph} (WLOG) is an oriented graph $\cal G$ on vertices $X=\{ x_1,\ldots ,x_k\}$, where each oriented edge is labeled by a word in $X^{\pm1}$. WLOGs give rise to presentations which generalize Wirtinger presentations of knots. WLOG presentations, where the underlying graph is a tree are of central importance in view of Whitehead's Asphericity Conjecture. We present a class of aspherical world labeled oriented graphs. This class can be used to produce highly non-injective aspherical labeled oriented trees and also aspherical cyclically presented groups.Comment: 7 pages, 3 figure