News Items: Terry Wyatt

• Special run for L3 tracking completed successfully
• 2nd iteration on p12 planning
• Planned modifications to L3 monitor statistics

Talks

• First results from L3 online monitoring histograms: Elliot Cheu.
  Plots were shown showing the electron, jet and tau multiplicity during online running. Hopefully this will be running in the control room after the shutdown. Some discusion followed about data selection for the monitoring histograms - whether it would be by trigger bit or by stream. Both should be possible. A question was raised as to whether we would want to simulate the filter cuts in the monitoring - since the output in the event record (debug info and physics results) contains all candidates not just those passing the filter cuts. It was suggested that this might be a bad idea since then it becomes essential to coordinate the monitoring with the currently running trigger lists.
• Global tracking - (online) performance studies: Daniel Whiteson.
  Daniel did not show events from the tracking special run as he had problems getting hold of the data from SAM. However he did show plots using the same code (p11.06.00 + road size change + latest geometry v8 ) as was used during the special run but on earlier data taken online. Daniel showed plots showing stereo tracking efficiency versus phi and eta where efficiency was defined as the number of stereo tracks reconstructed divided by the number of axial tracks. (number of stereo tracks must be <= axial tracks since they are constructed using the axial tracks). One feature in the data was that for higher Pt tracks there was a dip in efficiency around 1. < phi < 1.5. This could be due to some hardware problem or stereo trackfinding problem. Daniel also showed plots investigating the efficiency effects of the ptMin cut in the track reconstruction. He showed efficiency plots where efficiency was defined as number of tracks found with ptMin = value divided by number of tracks found with pt >= value and ptMin = 0. The DCA resolution of found tracks was around 60 microns in the central region (plot has a double gaussian form due to tracks with no SMT hits).
• Track matching studies:
  • Electrons: Ulla Blumenschein.
    Ulla gave a status report on the matching central tracks to electron clusters in the calorimeter for MC data of 1600 single electrons with 0.5 overlaid minimum bias events. At this stage she had just tried matching tracks to MC particles. Around 1580 were successfully matched but with no obvious reasons for the few match failures. However, nearly all the tracks had exactly 8 hits which suggest a possible alignment problem between the CFT and SMT geomtries used.
  • Taus: Yann Coadou.
    Yann gave a verbal report on the current status of track matching the Tau tool. He is currently looking at MC and want to implement a new way to propagate tracks based on the L3Propagator classes. One problem was that the matching was being done between "Detector eta" (for the clusters) and vertex corrected eta (propogated tracks). The question was asked as to where the match should be made - perhaps at some fixed radius as is currently done or maybe tracks should be propagated to the EM3 layer?

Discussion

• L3 global tracks use detector coordinates and are not corrected for the position of the beamspot (daniel)
• We need to document the process of how to get the correct geometries and cable-maps for different sets of MC and data (Yann) Other points raised were:
• Might want to include the merging of calibration files into the single calib file in d0tools
• Remove the runScriptRunner script and merge it into runD0trigsim. However since it currently takes so long to link d0trigsim it might be a good idea to continue to use the ScriptRunner_x executable instead of the D0TrigSim_x exe when doing L3 code development and testing.

Scribe: Jon Hays.