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

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Presentation transcript:

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

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!)

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

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

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

March 13, 2002 Daniel Whiteson Parameter Comparison

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