Energy flow observables in hadronic collisions

We present recent QCD calculations of energy flow distributions associated with the production of jets at wide rapidity separations in high-energy hadron collisions, and discuss the role of these observables to analyze contributions from parton showering and from multiple parton collisions.Comment: 6 pages, 4 figures. Contribution at MPI@LHC201

Resummed Predictions for the Structure Function F2 at Small x

We report the results of including resummed splitting functions in the QCD evolution equations at small x, and discuss the predictions that follow for the deep inelastic structure functions. *Contribution at XXX Rencontres de Moriond, Les Arcs, March 1995Comment: 8 pages, uuencoded postscrip

Endpoint singularities in unintegrated parton distributions

We examine the singular behavior from the endpoint region x -> 1 in parton distributions unintegrated in both longitudinal and transverse momenta. We identify and regularize the singularities by using the subtraction method, and compare this with the cut-off regularization method. The counterterms for the distributions with subtractive regularization are given in coordinate space by compact all-order expressions in terms of eikonal-line operators. We carry out an explicit calculation at one loop for the unintegrated quark distribution. We discuss the relation of the unintegrated parton distributions in subtractive regularization with the ordinary parton distributions

High-multiplicity final states and transverse-momentum dependent parton showering at hadron colliders

If large-angle multigluon radiation gives significant contributions to parton showers in the LHC high-energy region, appropriate generalizations of parton branching methods are required for Monte Carlo simulations of exclusive high-multiplicity final states. We discuss the use in this context of transverse-momentum dependent kernels which factorize in the region of high energies. We give examples based on ep and p pbar multi-jet data, and point to possible developments for distributions associated with massive final states at the LHC.Comment: 8 pages. Latex. Presented at Photon 200

Rescattering effects and the determination of the gluon density for x << 1

We consider the possible role of rescattering effects in the determination of the gluon density for the LHC from DIS data. We discuss a method that uses results of s-channel calculations to estimate these effects, and comment on potential applications to diffractive and multi-parton interactions.Comment: Talk presented at the XLII Rencontres de Moriond (La Thuile, March 2007

Production of jets at forward rapidities in hadronic collisions

We discuss high-pT production processes at forward rapidities in hadron-hadron collisions, and describe recent results from using QCD high-energy factorization in forward jet production at the LHC.Comment: 8 pages. Latex. Proceedings of La Thuile 200

Nonperturbative corrections from an s-channel approach

We report on studies of multi-parton corrections from nonlocal operator expansion. We discuss relations between eikonal-line matrix elements and parton distributions, and present an illustration for initial-state collinear evolution.Comment: Contribution to "HERA and the LHC" Workshop Proceedings, CERN, 200