1. March 13, 2002 Daniel Whiteson L3 tracking - muons! Daniel Whiteson LBL

2. March 13, 2002 Daniel Whiteson Single muon trigger Triggers mu1ptx{a,b,c,w}txx are prescaled by 20 and are very impure (~5%) An improvement in rejection could increase the physics bandwidth for real muons (find more W ’s!)

3. March 13, 2002 Daniel Whiteson Can we find muon tracks? GTR L3Global Tracker Propagate tracks to the muon A-layer, look for match in dr = local distance in plane of A-layer

4. March 13, 2002 Daniel Whiteson Track spectrum - run 147475 We need to look at the Pt spectrum of the leading tracks Events with no track found Rejection Factor = 1/(1-%remaining)

5. March 13, 2002 Daniel Whiteson Efficiency & Rejection Rejection Factor from leading track Event Efficiency on sample of tight offline  with pt>3.0 At 50% efficiency, rejection of ~20 CFT Tracking with 8 hits required

6. March 13, 2002 Daniel Whiteson Parameter Comparison

7. March 13, 2002 Daniel Whiteson L3-GTR track matching Using offline geometry database Number of SMT hits jumps!