Unintegrated parton density functions (2008)
John Collins, Markus Diehl, Hannes Jung, Leif Lönnblad, Michael Lublinsky, Thomas Teubner
An overview on activities to determine unintegrated parton density functions is given and the concept and need for unintegrated PDFs is discussed. It is also argued that it is important to...
CASCADE is a full hadron-level Monte Carlo event generator for ep, γp, pp and p¯p processes. CASCADE uses the unintegrated parton distribution functions convoluted with off-mass shell matrix...
Saturation effects in final states due to CCFM with absorptive boundary (2008)
Kutak, Krzysztof, Jung, Hannes
We apply the absorptive boundary prescription to include saturation effects in CCFM evolution equation. We are in particular interested in saturation effects in exclusive processes which can be...
What HERA may provide ? (2008)
Jung, Hannes, De Roeck, Albert, Bartels, Jochen, Behnke, Olaf, Blumlein, Johannes, Brodsky, Stanley, ...
More than 100 people participated in a discussion session at the DIS08 workshop on the topic What HERA may provide. A summary of the discussion with a structured outlook and list of desirable...
RAPGAP, originally developed to describe rapidity gap event in ep collisions, has evolved into a multi-purpose Monte Carlo event generator for diffractive and non-diffractive processes at ep...
Valence quarks and $k_T$ factorisation (2008)
Deák, Michal, Jung, Hannes, Kutak, Krzysztof
We study in the $k_T$ factorisation framework jet production at LHC energies. In particular we are interested in valence quark and gluon initiated jets. The calculation of the relevant hard matrix...
Unintegrated parton density functions (2008)
John Collins, Markus Diehl, Hannes Jung, Leif Lönnblad, Michael Lublinsky, Thomas Teubner
An overview on activities to determine unintegrated parton density functions is given and the concept and need for unintegrated PDFs is discussed. It is also argued that it is important to...
Vector meson cross sections at HERA (2008)
Inelastic and elastic (exclusive) cross section measurements of vector meson production at HERA are discussed.
Some Comments on the Current Status of Event Generators for Small-X (2007)
. We discuss some aspects of the current status of event generators for small-x DIS. In particular we report on recent results using the CCFM evolution implemented in the SMALLX and CASCADE program...
We have obtained a good description of F2 and also the forward jet measurements at HERA as well as measurements on charm and bottom. Furthermore, with the same un-integrated gluon density, we...
Towards precision determination of uPDFs (2007)
The unintegrated Parton Density Function of the gluon is obtained from a fit to dijet production in DIS as measured at HERA. Reasonable descriptions of the measurements are obtained, and a first...
Small x Phenomenology - summary of the 3rd Lund Small x Workshop in 2004 (2006)
Collaboration, The Small X, Bartels, Jochen, Barnafoldi, Gergely G., Chachamis, Grigorios, Collins, John, ...
A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the...
Small x Phenomenology - summary of the 3rd Lund Small x Workshop in 2004 (2006)
Andersen Serguei Baranov, Jeppe R., Bartels, Jochen, Barnafoldi, Gergely G., Chachamis, Grigorios, Collins, John, ...
A third workshop on small-x physics, within the Small-x Collaboration, was held in Hamburg in May 2004 with the aim of overviewing recent theoretical progress in this area and summarizing the...
Need for fully unintegrated parton densities (2005)
Associated with the use of conventional integrated parton densities are kinematic approximations on parton momenta which result in unphysical differential distributions for final-state particles. We...
Un-integrated PDFs in CCFM (2004)
The un-integrated parton distribution functions (uPDFs) obtained from a CCFM evolution are studied in terms of the intrinsic transverse momentum distribution at low scales. The uPDFs are studied for...
Recent results from CCFM evolution (2003)
Recent developments of the small $x$ CCFM evolution are described, including improvements of the splitting function. The resulting unintegrated gluon densities are used for predictions of hadronic...
The basic ideas of kt-factorization and CCFM parton evolution is discussed. The unintegrated gluon densities, obtained from CCFM fits to the proton structure function data at HERA are used to predict...
Small-x Physics and Forward Jet Production at THERA (2001)
We discuss some aspects of forward jet production as a signature for small $x$ physics at THERA energies.
Monte Carlo Generators and the CCFM Equation (2000)
We discuss three implementations of the CCFM evolution equations in event generator programs. We find that some of them are able to describe observables such as forward jet rates in DIS at HERA, but...