13,426 research outputs found
Total Cross-sections and Bloch-Nordsieck Gluon Resummation
The physics underlying the fall and eventual rise in various total
cross-sections at high energies has been investigated over a decade using a
model based on the Bloch-Nordsieck resummation in QCD. Here a brief review of
our latest results is presented and comparison made with experimental data on
, and total cross-sections.Comment: Presented by G. Pancheri at ISMD04, Sonoma State University. Under
publication in Acta Physica Polonica. LaTeX format, 10 *.eps files, 7 page
Application of Navier-Stokes analysis to stall flutter
A solution procedure was developed to investigate the two-dimensional, one- or two-dimensional flutter characteristics of arbitrary airfoils. This procedure requires a simultaneous integration in time of the solid and fluid equations of motion. The fluid equations of motion are the unsteady compressible Navier-Stokes equations, solved in a body-fitted moving coordinate system using an approximate factorization scheme. The solid equations of motion are integrated in time using an Euler implicit scheme. Flutter is said to occur if small disturbances imposed on the airfoil attitude lead to divergent oscillatory motions at subsequent times. The flutter characteristics of airfoils in subsonic speed at high angles of attack and airfoils in high subsonic and transonic speeds at low angles of attack are investigated. The stall flutter characteristics are also predicted using the same procedure
Total cross sections and soft gluon resummation
We discuss a model for total hadronic and photonic cross-sections which
includes hard parton-parton scattering to drive the rise and soft gluon
resummation to tame it. Unitarity is ensured by embedding the cross-section in
the eikonal formalism. Predictions for LHC and ILC are presented.Comment: 9 pages, 2 figures, Presented at PLC2005, Kazimierz, September 2005,
requires appolb.cl
Total cross-section at LHC from minijets and soft gluon resummation in the infrared region
A model for total cross-sections incorporating QCD jet cross-sections and
soft gluon resummation is described and compared with present data on and
cross-sections. Predictions for LHC are presented for different
parameter sets. It is shown that they differ according to the small x-behaviour
of available parton density functions.Comment: 10 pages, 3 figures, uses appolb.cls, LaTeX. Talk presented by G.
Pancheri at the EURIDICE Final Meeting, August 24-27th, 2006, Kazimierz,
Polan
Soft Gluons and the Energy Dependence of Total Cross-Sections
We discuss the high energy behaviour of total cross-sections for protons and
photons, in a QCD based framework with particular emphasis on the role played
by soft gluonsComment: 13 pages, 10 figures, Presented by G. Pancheri at the International
Workshop on QCD, Martina Franca, Italy, June 16-20,2001. To appear in the
proceeding
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