Request for a DESY Summer Student in 2011
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   Name : Sebastian Johnert    email : sebastian.johnert@desy.de
  
   Tel  : 3169                 Building/Room : 03/039
 
   DESY-Group/Experiment : ATLAS

 
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   Short description of the project the student should work on  :

The summerstudent will work on generator studies and MC uncertainties
of pp->W->taunu and pp->Z->tautau processes and will check the tau
behaviours at center of mass energies of the LHC using the
HepMCAnalysis Tool.  Tau leptons play an important role in the final
states in the search for new particles and new physics like the SM
Higgs (H->tautau) or supersymmetrie (SUSY). Therefore SM taus (e.g. in
the decays W->taunu or Z-tautau) have to be well understood.

The HepMCAnalysis Tool is a package developed by the DESY ATLAS group
for MC generator validation and comparisons. It allocates a stable,
easy comprehensible and extensible software environment for generator
studies.  The HepMCAnalysis Tool provides a class library of generator
studies for different physics processes which are relevant for tuning
and validation. These analyses covers a large area of physics aspects
(hard scattering, parton shower, fragmentation, ...). The analyses are
based on the generator independent HepMC data format and so they allow
a direct comparison between different MC generators.  Programs to run
a generator and to generate events in the HepMC data format are
provided. The generators are set up in a way that they describe
existing data and that the different generators can be compared
immediately.

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   Physics / Computing/ Engineering  Content of the project :

During his/her stay the summer student will acquaint with MC
generators and he will deepen his/her understanding of the Standard
Model of particle physcics, especially in a special particle
production and decay.
   
He/She will investiagte the tau properties in pp->W->taunu and
pp->Z->tautau production using the HepMCAnalysis tools and study the
differences originating from the choice of different generators,
particle densisty functions and MC tunes. A strategy should be
developed how this studies can be used to access systematic
uncertainties for the correspoding measurements.


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  Special Qualifications expected from the student ( Computing,...) :
 
some basic C++ and ROOT knowledge would be appraciated but he/she can
also learn it during the summer student program.

 
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  Other remarks :  

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   Supervisor(s) during the project (19/07/11 - 8/09/11) :
 
   Name: Sebastian Johnert Tel: 3169 email : sebastian.johnert@desy.de