Simulation meeting minutes, 16 Aug 2004

The next simulation meeting is scheduled for 8:30 AM on Monday, Aug 16th, 2004. If you wish to participate, please dial +1(510) 665-5437, enter 1 and the passcode 7548#, then follow instructions. The BeeHive, Central Lab G203 (second floor), has been reserved for 1.5 hours.

If you have something that you would like to present, please contact Steven Robertson (steven@slac.stanford.edu) in order to be added to the agenda. Contribution to the meeting should be placed at here and linked to the agenda located here.

• Core issues:
  •  GVertex problem fixed.  Bgssensitvemanager builds gtracks from g4tracks -> inital and terminal vertices identical.  Problem has been around from beginning.   GetPosition gets end of track.  Fix requested to go into release (tag posted), but mayy not yet be in  due to i/o streams migration.   Does this have any consequences on current (or old) simulation?   Need to talk to Dave.
    
  • Ghits from BgsApp bertini vs low energy param models (geisha) to be checked before it goes into production.  Few apparent differences, but twice as many muons with bertini (possibily due to more pions decaying?)
  • high precision neutral processes are in . 
    
• Subsystems:
  
  • PEP/MDI/Backgrounds
  • Bill testing Moose, populate Dch histograms -> either DircSim tag or 15.3.0 .   produce tag set for ~15.5.0.  compare moose output between 15.3.0 and 15.5.0.  run dch...ntuple module (marcus Christiani) for correct config.  Will talk to other subsystems people re how to do it for other subsystem.   Used bhwide at ~5degrees to populate dch histograms.
  • bbbrem should be interfaced BgsApp within next day or two
  • mario and giovanni provided missing geometry last week, but problem with BgsLocation (q2 etc in wrong frame).  removed (on vacation last week)
  • more forward to 15.5 ?? i/o streams migrated (available, but running??)
    
  • Jo will run BgsApp w/ and w/o Mario's tag and check histograms.  Also attempting to get Moose running with extended geometry (will move to 15.3+)
    
  • SVT:
  • DCH: 
    
  • crosstalk code improved and blessed by Gerhard.  Waiting to be tagged (i/o streams) generate validation ntuples for pid and trigger people (over next couple of weeks).  will make  collections for bbbar, mumu and rad bhabhas.  Q:  do we have disc space for collections?   Q: (SR) does sim group need space??  Bill: useful to have space for histos... 
      Q: Jeff  which mupair generator to use for validation studies??  Discussion...  want to compare data with MC.  "Better" mean whatever subgroups want (PID: dE/dx, trigger:  vs theta). 
    
  • DRC:  
    
  • Did PID meeting get moved?
  • EMC:   
  • IFR:   
  • Trigger:
• Fast MC  
  
• Generators:  
  
• Abi just got back.   List of needs from AWG's to provide updates.  Easy part is new br's, while  spectra etc will be more difficult.  Doesn't take much time to generate but involves much trial and error.   Brian working on new fragmentation model (forgot name).  David W: can't use same fragmentation model for D and Ds;.  Jetset has only one fragmentation function (makes c, cbar then fragments).    What do higher resonances contribute?? .  Hard  fragmentaion  (i.e. low multiplicity) could be generated using dedicated generator.   Need multiplicity distribution, rapidity dist. etc.   SR:  How much work is this?  David will look into a possible program (a la LEP) for tuning fragmentation model. 
  
• AOB: 
  
• SR:Validation of new sim releases?    Dennis:  Adrian Bevan was to have developed a package.  Dave W:  problem is finding good clean data/MC comparisons.  Possible control sample Ds.  dimuons, tautau, breco, general conuum (get rid of tautau).   Feeddown from Y(3S)??   Needs expertise from several AWG's etc.  PAC.  SR will follow up.
  

Action items