DØ Level 3 Algorithms Meeting: 8th May 2002 in the Farside

Elliot Cheu is a professor from Arizona, who has just joined D0. Elliot has expressed a strong interest in getting involved in monitoring, which as we all know is one of the areas we most need additional manpower in L3 at the moment. As we discussed at the L3 Algorithms meeting on Wednesday, Michiel Sanders will be implementing l3fanalyze to run online. The roottuple produced by l3fanalyze will be read in a continuously updating fashion by a root macro that fills histograms defined by the L3 group.
Elliot has agreed to be responsible for the histogram macro, based on a template that Michiel will provide. So, in the next week or so, tool authors should expect to be hearing from Elliot for up to date documentation of their l3fanalyze roottuple contents (yes, we really mean it!!!) and for some suggestions of the histograms that are most likely to be useful in showing up problems with detector or algorithm performance.
In the not too distant future Elliot hopes to bring a postdoc and a PhD student into work on L3 algorithms, too.
global_CalMuon-7.00, which has muon filters in 100% Mark&Pass mode is now running online.

More problems in trying to run TrigSim on recent data: Yann Coadou.
Some plots on increasing rejection of L3 electron filters: Ulla Blumenschein.
The first plot shows the rejection for the OR, as it is handled currently: tight shape + Emfr>0.9 in [Ptmin,Ptmax] || Emfr>0.9 for Pt > Ptmax for 2 values of Ptmin (12,14). The second plot shows the contribution of Emfr-only for Pt > Ptmin. Seems, that if we want a rejection of about 6, we probably cannot stay with the 'only-Emfr' sample for Pt>15 - we would have to tighten the cuts for Pt 15-17(20) as well. As you can see from the first plot, an option would be - Emfr+shape for Pt 14-17 - Emfr only for Pt>17 But we have yet to think about it.
L3Muon progress: Martin Wegner.
- L3 loose muon definition now includes BC-only segments everywhere (not just in bottom central region).
- In 5 GeV pT Monte Carlo single muons the pT resolution for BC-only is not much worse than that for other loose muons.

Scribe: Terry Wyatt.