1. Current plans FTK meeting 2/23/06 F. Crescioli, P.Giannetti, M. Dell’Orso, G. Punzi, G.Volpi, + Cheng-Ju Lin

2. Plans for FTKsim We go for immediate release of current FTKsim (days). We think it now behaves correctly for 6/6 tracks (80%). Everybody can use it for: –Get used to code, beta-test –Evaluate performances, provided you restrict to 6/6 tracks We turn to implementing majority logic, to be plugged in seamlessly in the next release. What we know we need to do is not much (<2weeks), but there can be surprises. No time estimate now, but in few days we will know whether there is a big problem or not.

3. Plans for Bs->  We are doing this together with Cheng-Ju We started by trying to understand past studies. This proved more difficult than we thought: there is little written information behind the TDR discussion. Estimates are 3-sigma with 30fb-1, but it is not even clear what is included in the quoted “background” Current strategy uses the 2-  of 6GeV at L1 It is generally believed that the above will have high rates except at the lowest luminosities, but it hard to get down to numbers Plan: try to demonstrate a relative improvement in purity from FTK rather than absolute performance. We also want to look at Bs->µµ yield vs Pr cuts to see when the efficiency becomes just too low.

4. Plans for Bs->  One important difference between ATLAS and CDF is mass resolution: ATLAS:  M = 70 MeV vs CDF:  M =25 MeV This means the B->hh (BR= 4*10 -5 ) peak overlaps with Bs->  (BR ~10 -10 ). The implication is that we cannot work with muons of inferior quality. A possibility for a big gain from FTK is to trigger on one golden muon + one lower-quality muon. However, the second muon need to have very high rejection of hadrons; we need to check it. Easier is to evaluate the rejection FTK can provide on 2- muons. We can use several cuts: –Invariant Mass –3-D vertex –Lxy or L3D –Pointing –Isolation We are now in the position of making larger Bs->  samples and 2-  background samples and evaluate rejection with FTKsim or its parametrized resolution- this should be feasible in 1-2 months. However, we still need to figure out how we will compare this with “standard” performance. Could one argue that all of the above be done without FTK just the same ? Isolation is one that would certainly be difficult.