12,270 research outputs found
Pomeron fan diagrams in perturbative QCD
Within QCD reggeon field theory we study the formation of two subsequent
triple pomeron vertices in the process PPPPPP. We make use of an
earlier investigation ~\cite{Bartels:1999aw} of the six-reggeon amplitude in
deep inelastic scattering and show that in the large- limit pomeron fan
diagrams emerge with the same triple pomeron vertex in all places. We thus
confirm the BK-equation, but we also find additional terms related to the
reggeization of the gluon, and we discuss their potential significance. Our
analysis also includes the general pomeron two odderon vertex: a
particular version of this vertex has been included into earlier
generalizations the BK equation.Comment: 22 pages, 10 figure
The Farrell-Hsiang method revisited
We present a sufficient condition for groups to satisfy the Farrell-Jones
Conjecture in algebraic K-theory and L-theory. The condition is formulated in
terms of finite quotients of the group in question and is motivated by work of
Farrell-Hsiang.Comment: This version is different from the published version. A number of
typos and an incorrect formula for the transfer before Lemma 6.3 pointed out
by Holger Reich have been correcte
Solution of Twist-3 Evolution Equation in Double Logarithmic Approximation in QCD
The solution of DGLAP evolution equation for the twist-3 gluon operators is
obtained in the Double Logarithmic Approximation of QCD perturbation theory.
The method used for the solution is similar to the reggeon field theory. The
asymptotics of the twist-3 parton correlation function for the small Bjorken
variables is found.Comment: 12 pages, 4 figures, added references and comment
A momentum Space Analysis of the Triple Pomeron Vertex in pQCD
We study properties of the momentum space Triple Pomeron Vertex in
perturbative QCD. Particular attention is given to the collinear limit where
transverse momenta on one side of the vertex are much larger than on the other
side. We also comment on the kernels in nonlinear evolution equations.Comment: Minor misprints corrected. To be published in EPJ
Massive c\bar c g - Calculation in Diffractive DIS and Diffractive D^* - Production at HERA
We calculate the cross section for -production in diffractive DIS
with finite quark masses at zero momentum transfer . The calculation is done
in the leading log(1/) approximation and is valid in the region of high
diffractive masses (small ). We apply our cross section formula
including both - and in a Monte Carlo simulation to
diffractive meson production at HERA. We compare our predictions to
results of H1 using three parameterizations for the unintegrated gluon density.Comment: 11 pages, 5 figure
NLO jet production in k_T factorization
We discuss the inclusive production of jets in the central region of rapidity
in the context of k_T-factorization at next-to-leading order (NLO).
Calculations are performed in the Regge limit making use of the NLO BFKL
results. We introduce a jet cone definition and carry out a proper phase--space
separation into multi-Regge and quasi-multi-Regge kinematic regions. We discuss
two situations: scattering of highly virtual photons, which requires a
symmetric energy scale to separate impact factors from the gluon Green's
function, and hadron-hadron collisions, where a non-symmetric scale choice is
needed.Comment: 7 pages, 1 figure, prepared for the 12th International Conference on
Elastic and Diffractive Scattering, DESY, Hamburg, 21-25 May 200
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