The combined ntuple can be produced when running the reconstruction (in atlsim or atrecon environment) or from the RECB banks saved from a previously run reconstruction job.

CBNT is now fully integrated into Atrecon. In general, one should use the official executable $SRT_DIST/current/installed/$SRT_TARGET/bin/main_atrecon or, if atrecon needs to be relink with different reconstruction packages or personal code, the official installation procedure (with SRT/CVS) described here, (to be used in directory atrecon) will create a tree work/ XXX with the executable. In both cases you need to have SRT variables defined (instructions here).

Only if one wants the latest bug fixes, Atlfast, or run within atlsim, or some more elaborate examples, one needs to use files in ~droussea/public/cbnt/pro and below.

The full tree can be copied in the user own directory by cp -R ~droussea/public/cbnt/pro pro.

Atlsim can be used in directory pro/atlsim, atrecon can be used in pro/atrecon

Example input files are available in directory pro/event:

  • H100bb.O containing fully simulated H(100)->bb events ,
  • H100bb_RECB.O points to a handfull of these events reconstructed (full detector reconstruction but  no ipatrec, no pixlrec)
  • If a file seem to have disappear, the corresponding tape must be staged again
  • pro/atrecon/atlas_h100bb.his contains the cbnt from a few events (ignore first event which is empty)
  • Before creating a new ntuple, ZEBRA.P should be linked onto one of the above files e.g (ln -s ../event/H100bb_RECB.O   ZEBRA.P)
  • Datacards example are available in /work/AtreconMain/datacard/ (from CVS)


    • The content of the ntuple can be adapted to the user using switches and parameters in data cards DETP CBNT. A user routine has also been provided.

    Driving datacards and variables are described here

    With Atlsim (WARNING obsolete as long as no recipe to rebuilt cbnt.g from cvs)

  • In directory pro/atlsim
  • Make sure ZEBRA.P points to the right datafile
  • If ZEBRA.P points to an unreconstructed file, switch reconstruction on in cbnt.kumac (DORECO=1, only xkalman will be run for time being)
  • Set the datacards DETP CBNT according to your requirements (be careful : no space before the =, one space after the =,  and numbers should respect their declared types (no "." for integers))
  • then type:
    • atlsim -G 12
    exe cbnt
    (nt/plo 3333.xxx, nt/pri 3333, nt/scan 3333 ! ! ! ! xxx)
    exit
  • histogram cbnt.his contains the ntuple number 3333 in directory cbnt
  • "-G 12" is used to enlarge ZEBRA memory in Atlsim. This maybe necessary when running on fully simulated events with calorimeters and muon spectrometer.

    • With Atrecon

  • In directory pro/atrecon
  • Make sure ZEBRA.P points to the right datafile
  • if no cbntuser routine was used, the standard atrecon executable can be used: ln -fs atrecon_standard atrecon
  • if atrecon was relinked (see below), create a link to this executable
  • if ZEBRA.P points to an unreconstructed file, use datacard reco_cbnt.databack  (which switches on the full reconstruction (except pixlrec and ipatrec))
  • if ZEBRA.P points to a reconstructed file, switch off all reconstruction in the datacards (set all RECO to 1, except the one from CBNT, set OUTP to 0, make sure you have the datacards *BKIO 'P' 'RECB')
  • Set the datacards *DETP 'CBNT'  according to your requirements  (be careful: no space after the keyword, and all numbers are real ("." is mandatory, even for integers)). Switch on the necessary reconstruction packages.
  • type:
    • atrecon <reco_cbnt.databack >atrecon.out
  • file atlas.his contain the ntuple
  • to store RECB banks in output ZEBRA.O, change OUTP   0 to OUTP 1 in reco_cbnt.databack

    • The special case of atlfast

  • To use atlfast, the usual file atlfast.dat specifying atlfast options should be present, and also a pointer to a "data" directory where it will pick all the smearing parameters:
  • cp /afs/cern.ch/atlas/www/GROUPS/PHYSICS/HIGGS/ATLFAST-dir/dev/atlfast/data/atlfast.dat atlfast.dat
  • ln -s /afs/cern.ch/atlas/www/GROUPS/PHYSICS/HIGGS/ATLFAST-dir/dev/atlfast/data data

    •  
  • CBNTATLF the interface to atlfast is available both for atlsim and atrecon.
  • Since release 0.0.37, the interface  is available in the official releases. Only one executable is available with atlfast : atrecon_CXF (with calorimeter and xkalman.).
  • To have atlfast available in your own executable (see below), GNUmakefile.in should be modified so that $(ATLFAST_LIB) appears between $(ATLAS_LIB1) and $(ATLAS_LIB2) in the definition of main_atrecon_LIBS (where "main_atrecon" can be replaced by any standard atrecon executable) (as done for atrecon_CXF_LIBS)

    •  
  • For atlsim, it has to be compiled a special way to load dynamically atlfast library. This is done with a makefile in directory cbnt/pro/atlsim/cbntatlf. The directory where atlsim is run should contain a link to cbntatlf.sl with the name cbntatlff.sl (Note the additional f to avoid untimely initialisation).

    • Modifying the user routine cbntuser

  • Cbntuser can be updated to perform personal analysis: driving datacards can be added, more variables added to the ntuple. All the banks are acessible (RECB, GENZ, KINE), the truth common (in $SRT_DIST/current/atrecon/include/atrecon/cbntcdes/cbntttrack.inc , which can be used by adding #include "atrecon/cbntcdes/cbntttrack.inc" ) allows easy access to truth information, and also ATLFAST commons are available if switched on.
  • for atlsim pro/src/g/cbntuser.g should be edited
  • Switch on the user block in cbnt.kumac  (USER.BASIC= 1) or one of the .databack file
  • Run ATLSIM as above
  • Note that in directory pro/atlsim cbntuser.g is linked with the name cbntuserf.g to avoid untimely initialisation.

    •  
  • To relink atrecon executable with modified user routine:

    • - cd work/AtreconMain/src ; cp $SRT_DIST/current/atrecon/cbnt/cbntuser.age .
    - in work/GNUmakefile.in, add cbntuser.age to the list of SRC files (e.g. atrecon_CX_SRC if you are using atrecon_CX)
    - edit/modify cbntuser.age
    - delete main_atrecon, rerun gmake as in installation instructions
     
  • Read the Guidelines for contributors for more information on the code itself

    •  
    Comments/suggestions/assistance on this page or the CBNT itself  David.Rousseau@cern.ch