Talks

• Update on L3 tracking with full error calculations: Daniel Whiteson.
  The L3 global tracker now has an option to re-fit the tracks after the pattern recognition stage taking into account the position errors on the individual hits. The pull distributions have a width between 1 and 2 at the moment (not so bad given that this is a first attempt). Time consumption increases from 210 to 270 ms for ttbar events (d0mino debug version).
• Status of the L3 IP b-tagger for p12: Per Jonsson.
  Monte Carlo studies of l3fbtag_ip performance can be found on Per's homepage. On real data we need primary vertex information. Since event-by-event information will not be available in p12, the primary vertex found by vertex examine will be used. Per will implement the infrastructure to read this information from a flat file. Michiel Sanders, who is now responsible for vertex examine, will make the file. Signed impact parameter pull distributions in data has a width of around unity and no sign of genuine lifetime content. Check on samples with lifetime information needed.

Discussion Item

• Updating the L3 Algorithms plans for p12 page is continuing.

Scribe: Terry Wyatt.