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

UIUC Muon Trigger Status S. Davis, M. Haney, M. Selen. Previous work has shown fitting & cutting on c 2 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:

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

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  1. 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). • (U–V) is related to f and is also pretty good!

  2. 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 constraint:U + 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.

  3. 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 RNis the radial tube in station N. (numbering is out  in)

  4. 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

  5. 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.

  6. 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 UVNis (U tube – V tube) in station N. (numbering is out  in)

  7. 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.

  8. 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…

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