1,409 research outputs found
Aspects of Higgs Production at the LHC
We discuss the main features and predictions of the GLMM model, which is
based on a QCD motivated theoretical approach, and successfully describes the
experimental data on total, elastic and diffractive cross sections. In addition
we calculate the survival probability for a SM Higgs at the LHC, and compare
our results with those of the Durham group.Comment: 7 pages, 4 figures, talk at 13th International Confernce on Elastic
and Diffractive Scattering, CERN, 29th June - 3rd July 200
QCD Saturation and Soft Processes
We show that an approximate solution to the amended non-linear
Balitsky-Kovchegov evolution equation which was formulated for hard QCD
processes, can be extended to provide a good description of photoproduction and
soft hadronic (non perturbative) reactions.Comment: 3 pages, 4 Postscript figures, Contribution to the Proceedings of the
International European Conference on High Energy Physics EPS (July 17-23,
2003) Aachen, German
EFFECTS OF SHADOWING IN DOUBLE POMERON EXCHANGE PROCESSES
The effects of shadowing in double Pomeron exchange processes are
investigated within an eikonal approach with a Gaussian input. Damping factors
due to screening are calculated for this process and compared with the factors
obtained for total, elastic and single diffraction cross sections. Our main
conclusion is that counting rate calculations, of various double Pomeron
exchange processes (without screening corrections) such as heavy quark and
Higgs production are reduced by a factor of 5 in the LHC energy range, when
screening corrections are applied.Comment: 9 pages, latex, 5 figures obtainable from author
Behaviour of the forward peak in hard diffractive leptoproduction of vector mesons
The measured forward slope in elastic and inelastic leptoproduction of vector
mesons differ by a substantial amount. In an attempt to describe this
phenomenon we construct a two radii model for the target proton, and estimate
the effective parameters of the hard Pomeron obtained from a pQCD dipole model
with eikonal shadowing corrections (SC). We show that the SC reduce the
intercept of the hard Pomeron and generate an effective shrinkage of the
forward peak and a diffractive dip at , which appears to
affect the value of the experimentally measured slope.Comment: 18 pages, 7 figures, one table, everything in tar.gz fil
The Role of Screening Corrections in High Energy Photoproduction
The role of screening corrections, calculated using the eikonal model, is
discussed in the context of soft photoproduction. We present a comprehensive
calculation considering the total,elastic and diffractive cross sections
jointly. We examine the differences between our results and those obtained from
the supercritical Pomeron-Reggeon model with no unitarity corrections.Comment: 12 pages (Replacement due to PostScript file problem in previous
posting
Survival probability of large rapidity gaps in QCD and N=4 SYM motivated model
In this paper we present a self consistent theoretical approach for the
calculation of the Survival Probability for central dijet production . These
calculations are performed in a model of high energy soft interactions based on
two ingredients:(i) the results of N=4 SYM, which at the moment is the only
theory that is able to deal with a large coupling constant; and (ii) the
required matching with high energy QCD. Assuming, in accordance with these
prerequisites, that soft Pomeron intercept is rather large and the slope of the
Pomeron trajectory is equal to zero, we derive analytical formulae that sum
both enhanced and semi-enhanced diagrams for elastic and diffractive
amplitudes. Using parameters obtained from a fit to the available experimental
data, we calculate the Survival Probability for central dijet production at
energies accessible at the LHC. The results presented here which include the
contribution of semi-enhanced and net diagrams, are considerably larger than
our previous estimates.Comment: 11 pages, 10 pictures in .eps file
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