Response to presentation of our plans

1
Response to presentation of our plans

• very positive response to talk on LCFI vertex
  package
• our plans for software development were
  welcomed
• the vertex package is seen as an essential tool
  for the physics studies
• needed for optimisation of various aspects of
  global detector design
• there was agreement that there are still
  deficiencies in the tracking
• capabilities currently available in MARLIN and
  that if our package was used
• with the current tracking, the results might
  not give a realistic picture of the
• detector performance
• timescale for our software development
  considered realistic
• (comment by Ties Behnke)

2
Developments in other areas I

• tracking code in MarlinReco
• vertex detector is now being used for tracking
  in MarlinReco (Steve Aplin)
• tracks are found in the TPC and then
  extrapolated backwards into the vertex detector
• this is a wrapper of the old BRAHMS code,
  suffering from all its deficiencies
• had discussion following earlier email exchange
  with Ariane Frey who is building up
• a group working on vertex detector simulation
  and physics at MPI Munich
• group linked to DEPFET development, but not tied
  to that technology
• initial plan is to work on vertex detector
  standalone tracking, later to be combined
• with tracking in the TPC (Alexei Raspereza)
• particle flow algorithms
• PFA algorithm WOLF by A Raspereza has become
  standard in MarlinReco
• promising development of alternative code by
  CALICE-Cambridge group started
• for the time being, both rely on cheaters for
  tracking - how realistic is performance?

3
Developments in other areas II

• detector description
• Damien Grandjean has implemented a GEANT-4
  description of the vertex detector
• in the format needed for MOKKA
• this description provides a set of free
  parameters that can be chosen by the user
• (e.g. Rbp), to be extended in the future
• MC samples
• DESY set up to generate significant MC samples
  using the GRID
• initially planned to generate samples to
  investigate performance of tools, later physics
• physics studies
• discussion with Pascal Gay
• interested in using our package when
  available, to look at ZHH events
• that channel definitely requires b- and c-tag,
  and might also profit from vertex charge
• agreed to stay in contact