UIUC Muon Trigger Status S. Davis, M. Haney, M. Selen

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UIUC Muon Trigger StatusS. Davis, M. Haney, M.
Selen

• Previous work has shown fitting cutting on c2
  has sufficient rejection efficiency (TDR).
• This shows it can be done, but its probably too
  slow to work in real-time on DSP's.
• Explore integer memory lookup approach
• Use R, U and V hit correlations as fingerprints
  of good muon events.
• R gives best information (bend plane).
• (UV) is related to f and is also pretty good!

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Algorithm used in this study

• Sparsify hits in each view.
• Adjacent multi-hits condensed to a single tube.
• Simple to do in hardware.
• Find R,U,V space-points in each station by
  exploiting the geometric constraintU V
  Rcos(22.5) 65.5
• Gets rid of most random R,U,V combinations.
• Efficient to do in software.
• Can exploit correlations between stations to do
  this even more efficiently in the end.

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3D Scatter plot in R0,R1,R2 spacefor a sample
of good muon candidates(all octants).
Points are veryhighly correlated(see rotated
plot)
R2
R1
R0
RN is the radial tube in station N.
(numbering is out ? in)
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Points are very well fit by a simple
plane. Very tight cuts canbe made in this
space.This is equivalent to a c2 lookup
tablefor a bend-plane fit.
R2
R0
R1
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• uds events
• good muon tracks

For uds events, only the R1,R2,R3 combination
closest to the good muon plane is shown for
each event.
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3D Scatter plot in UV0,UV1,UV2 space for a
sample of good muon candidates(all octants).
UV2
Again, points are highly correlated(rotated
plot)
UV1
UV0
UVN is (U tube V tube) in station N.
(numbering is out ? in)
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• uds events
• good muon tracks

For uds events, only the UV1,UV2,UV3
combination closest to the good muon R-plane is
shown for each event.
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Work in Progress

• Defining cuts in R0,R1,R2 and UV0,UV1,UV2
  spaces.
• Evaluate efficiency rejection.
• Tune cuts to make sure we can reproduce the
  original fitting c2 cut technique.
• Implement in DSP.
• Hope to have more to show soon