366 research outputs found
The QCD pomeron at TESLA - motivation and exclusive J/psi production
We briefly present the motivation for studying the processes mediated by the
QCD pomeron at high energy e+e- colliders. We describe the behaviour of the
cross-section for the reaction gamma gamma to J/psi J/psi obtained from the
BFKL equation with dominant non-leading corrections. We give the predictions
for the rates of anti-tagged e+e- to e+e- J/psi J/psi events in TESLA and
conclude that such reactions may be excellent probes of the hard pomeron.Comment: 8 pages, 3 figures, to appear in the Proceedings of the 2nd Joint
ECFA/DESY Study on Physics and Detectors for a Linear Electron-Positron
Collider, Obernai, France, October 199
Exclusive photo- and electroproduction at HERA as a possible probe of the odderon singularity in QCD
Theory and phenomenology of the eta_c photo- and electroproduction is
developed from the point of view of probing the odderon singularity in QCD
which corresponds to the three gluon exchange mechanism. This mechanism leads
to the cross-sections which are independent of W^2 for the exchange of three
non-interacting gluons or exhibit increase with increasing W^2 (or 1/x) for the
odderon intercept above unity. The \eta_c electroproduction in the three gluon
exchange mechanism is shown to be entirely controlled by the transversely
polarised virtual photons. The magnitude of the eta_c photoproduction
cross-section is estimated to be around 11-45pb. The t-dependence of the
differential cross-section is also discussed.Comment: 9 pages, LaTeX, uses epsfig.sty; Numerical error corrected. A factor
of 1/3 missing in amplitude in Eq.(8) added. Obtained gamma p -> eta_c p
cross-section smaller by a factor of 9 than in the original version of the
paper. Figures 4 and 5 changed accordingl
Amplitude death criteria for coupled complex Ginzburg-Landau systems
Amplitude death, which occurs in a system when one or more macroscopic
wavefunctions collapse to zero, has been observed in mutually coupled
solid-state lasers, analog circuits, and thermoacoustic oscillators, to name a
few applications. While studies have considered amplitude death on oscillator
systems and in externally forced complex Ginzburg-Landau systems, a route to
amplitude death has not been studied in autonomous continuum systems. We derive
simple analytic conditions for the onset of amplitude death of one macroscopic
wavefunction in a system of two coupled complex Ginzburg-Landau equations with
general nonlinear self- and cross-interaction terms. Our results give a more
general theoretical underpinning for recent amplitude death results reported in
the literature, and suggest an approach for tuning parameters in such systems
so that they either permit or prohibit amplitude death of a wavefunction
(depending on the application). Numerical simulation of the coupled complex
Ginzburg-Landau equations, for examples including cubic, cubic-quintic, and
saturable nonlinearities, is used to illustrate the analytical results.Comment: 7 pages, 4 figure
at very high energy
The next generation of -colliders will offer a possibility of clean
testing of QCD dynamics in the Regge limit. Recent progress in the theoretical
description of exclusive processes permits for many of them a consistent use of
the perturbative QCD methods.
We advocate that the exclusive diffractive production of two mesons
from virtual photons at very high energies should be measurable at the future
linear collider (LC).Comment: 4 pages, 2 figures, talk given at the conference Baryon 0
The unintegrated gluon distribution from the CCFM equation
The gluon distribution f(x, k_t^2,mu^2), unintegrated over the transverse
momentum k_t of the gluon, satisfies the angular-ordered CCFM equation which
interlocks the dependence on the scale k_t with the scale \mu of the probe. We
show how, to leading logarithmic accuracy, the equation can be simplified to a
single scale problem. In particular we demonstrate how to determine the
two-scale unintegrated distribution f(x,k_t^2,mu^2) from knowledge of the
integrated gluon obtained from a unified scheme embodying both BFKL and DGLAP
evolution.Comment: 16 pages LaTeX, 3 eps figure
Theoretical issues of small physics
The perturbative QCD predictions concerning deep inelastic scattering at low
are summarized. The theoretical framework based on the leading log
resummation and factorization theorem is described and some recent
developments concerning the BFKL equation and its generalization are discussed.
The QCD expectations concerning the small behaviour of the spin dependent
structure function are briefly summarized and the importance of
the double logarithmic terms which sum contributions containing the leading
powers of is emphasised. The role of studying final states
in deep inelastic scattering for revealing the details of the underlying
dynamics at low is pointed out and some dedicated measurements, like deep
inelastic scattering accompanied by an energetic jet, the measurement of the
transverse energy flow etc., are briefly discussed.Comment: 17 pages, LATEX, 7 uuencoded eps figures include
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