429 research outputs found
Eikonalized mini-jet cross-sections in collisions
In this note we assess the validity and uncertainties in the predictions of
the eikonalised mini-jet model for . We are able
to find a choice of parameters where the predictions are compatible with the
current data. Even for this restricted range of parameters the predictions at
the high c.m. energies, which can be reached at the TeV energy
colliders, differ by about . LEP 2 data can help pinpoint these
parameters and hence reduce the uncertainties in the predictions.Comment: 5 pages, latex, requires epsfig.sty, a4wide.sty, full ps file
available at http://hpteor.lnf.infn.it/pancheri/lc2000.p
Total Cross-sections
We examine the energy dependence of total cross-sections for photon processes
and discuss the QCD contribution to the rising behaviourComment: 5 pages, LaTeX, 2 figures, talk presented by G. Pancheri at Photon -
2001, The International Conference on Structure and Interactions of Photons,
Ascona, Sept. 2-7,2001. To appear in the proceeding
Photon-Photon total inelastic cross-section
We discuss predictions for the total inelastic gamma-gamma cross-section and
their model dependence on the input parameters. We compare results from a
simple extension of the Regge Pomeron exchange model as well as predictions
from the eikonalized mini-jet model with recent LEP data.Comment: 7 pages, LateX, 2 eps figures. Talk presented at Photon'97, Egmond
aan Zee, May 199
QCD and Total Cross-sections
We discuss models for total cross-sections, show their predictions for
photon-photon collisions and compare them with the recent LEP measurements. We
show that the extrapolations to high center of mass energies within various
models differ by large factors at high energies and discuss the precision
required from future measurements at the proposed Linear Collider which would
allow to distinguish between them.Comment: 7 pages, 4 figures, laTeX, requires sprocl.sty, added at the end. To
appear in the Proceedings of XXIX International Symposium on Mutliparticle
Dynamics, Brwon University, U.S.A., June 9
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
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
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-sections at very high energies: from protons to photons
A model for both proton and photon total cross-sections is presented and
compared with data. The model is based on the eikonal representation, with QCD
mini-jets to drive the rise and soft gluon kt-resummation into the Infrared
region to tame the excessive rise due to low-x perturbative gluons. We discuss
the effects of a singular but integrable expression for the Infrared gluon
spectrum on the high energy behaviour of the total cross-section expected in
this model.Comment: 13 pages, 4 figures, Tenth Workshop on Non-Perturbative Quantum
Chromodynamics at l'Institut Astrophysique de Paris, June 8-12, 200
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