Talks

• Tracking for p16:
  • Ideas on ways to improve tracking efficiency and resolution: Daniel Whiteson
    • Improve pt resolution by doing a refit. This is the highest priority in Daniel's view, and would be an excellent "stand-alone" project for a new person to get involved in.
    • Comment from Robert Illingworth: studies of hit errors and unpacker performance needed.
    • It would be good to separate the pattern recognition and hit selection stages. Do the former with a histogramming approach?
    • Standalone tracking filters have shown themselves to be very useful. However for certain purposes, for the pattern recognition stage we could have as an option to use regional tracking (using calorimeter or muons as seeds) instead of histogramming.
    • Some parameter tuning would be beneficial. This was done originally on Monte Carlo events and almost no tuning has occured since we had real data! E.g., we know that if only a single SMT hit is added to a track it is usually a fake.
  • Tracking studies at IC: Ray Beuselinck
    • Ray is working with Tim Scanlon, who is a 1st year graduate student at IC.
    • The MC/L3 (or offline/L3) comparator tool has been upgraded.
    • Work is going on to improve efficiency, purity and speed of the axial track finding. Results currently in flux.
    • It was pointed out that samples with MC hit associations do exist and these have been communicated to Ray.
  • Tracking studies at Arizona: Peter Tamburello
    • Work will initially concentrate on trying to improve the performance of the tracking in the |eta|<1.5 region. Then extension to the forward region will be tackled.
    • Testing of reducing the number of hit layers required is in progress. Using layers 6/7 as seed layers also (increases geometrical acceptance as well as efficiency in central region).
• Making more use of the l3 primary vertex:
  • Electrons: Reinhard Schwienhorst
  • Missing ET: Markus Klute
  For more details see Reinhard's talk at the 2nd April 2003 L3 meeting!

Discussion Items

• Red or white wine?
  (Celebrate Terry's last meeting as co-convener of the group.)
  Thanks to everyone who has been involved in the work of the L3 algorithms group for their friendly collaboration and help over the last 15 months.

Scribe: Terry Wyatt.