L3 tracking - muons! Daniel Whiteson LBL : L3 tracking - muons! Daniel Whiteson LBL
Single muon trigger : 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!)
Can we find muon tracks? : 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
Track spectrum - run 147475 : 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)
Efficiency & Rejection : Efficiency & Rejection Rejection
Factor
from
leading
track Event
Efficiency
on sample
of tight
offline m
with pt>3.0 At 50% efficiency,
rejection of ~20 CFT
Tracking
with
8 hits
required
Parameter Comparison : Parameter Comparison
L3-GTR track matching : L3-GTR track matching Using offline
geometry
database Number of
SMT hits jumps!