until now

Developemnt of TMD Monte Carlo generator CASCADE3 and studies on TMD densities and phenomenological implications

2017 -

Determination of TMD parton densities from inclusive measurements at HERA applying the Parton Branching method at NLO.

2013  –  2016   

Development of a scheme to solve the coupled evolution equations (DGLAP and CCFM) with  a Monte Carlo method and determination of the (unintegrated) Transverse Momentum Dependent (TMD) parton densities

2008 – now

Extension of the CASCADE Monte Carlo generator to include processes relevant for LHC, like forward jets, Drell-Yan and Higgs production

2008 – 2009

Chair and Convener of the Monte Carlo group in the analysis center of the Helmholtz Alliance “Physics at the Terascale

2004 – 2008

Chair of the HERA-LHC workshop and contributions to studies concerning a better understanding and measurements of the unintegrated gluon density

2002 – 2003

Studies of non-leading corrections to the CCFM evolution equation. New sets ofunintegrated gluon densities were obtained from precision fits to the structure function F2 as measured by the H1 and ZEUS collaborations. First attempts to calculate Higgs production at LHC energies in the kt -factorization approach using the CCFM unintegrated gluon densities

2001 – 2002

Extension of the Monte Carlo generator CASCADE to describe also  processes. In the framework of kt -factorization supplemented with the CCFM evolution equation,  at the Tevatron and also partially at HERA can be consistently described 

1999 – 2002

Close collaboration with B. Andersson, G. Gustafson and L. Lönnblad  (Department of Theoretical Physics, Lund, Sweden) for a better understanding of the different approaches to implement the CCFM equation into Monte Carlo generators. A Lund Small x   workshop was organized in march 2001. Together with colleagues from Moscow studies  for a deeper understanding of the kt factorization approach (supported from the Royal Academy of Science, Sweden)

1999 – 2001

Intensive studies for a consistent implementation of NLO calculations into the Monte Carlo generator RAPGAP in collaboration with J. Collins, Penn State University. For the first time the  processes are combined via a special subtraction scheme with initial and  final state parton showers, making the standard pt -cut obsolete

1998 – 2001

Intensive studies of the CCFM evolution equation for a theoretically well based description of small x  hadronic final state properties. A unique solution of the CCFM equation which allows to describe the inclusive structure function F2  and the forward jet cross sections simultaneously was obtained. Development of a new hadron level Monte Carlo program CASCADE, which includes consistently the CCFM evolution equation

1998 – 1999

Initiative for a workshop on Monte Carlo Generators for HERA physics with the aim to develop a better theoretical basis as well as a consistent implementation of and processes into Monte Carlo event generators.

1996 – 2000

Extension of the RAPGAP Monte Carlo generator into a general multi-purpose program, including also the simulation of non-diffractive processes. Implementation of the concept of resolved photons in DIS was implemented for a very good description of most phenomena not described by other standard DIS Monte Carlos making RAPGAP one of the most frequently used event generators by the H1 and ZEUS experiments, for diffraction, for jet analyzes and for heavy flavor production as well. Continuous dialog with experimentalists from both H1 and ZEUS experiments on ongoing analyzes and the interpretation of the measurements

1994 – 1996

Development of the new Monte Carlo generator RAPGAP for events with large rapidity gaps in deep inelastic ep scattering as the first event generator fully suitable for deep inelastic diffraction and is extensively used in the analyzes of deep inelastic diffraction by the H1 and ZEUS experiments at HERA

1988 – 1993 

Development of the new Monte Carlo generator EPJPSI for  J/psi production in gamma-p, e-p and pp collisions including all production mechanisms at high energies.  Improvement of the model for inelastic J/psi photo-production using relativistic corrections. Uniform description of elastic, diffractive and inelastic J/psi  photo-production.