Sector Processor Simulation Status

CMS: March, 2002. B. Scurlock, University of Florida 1

Sector Processor Simulation StatusSector Processor Simulation Status

Bobby Scurlock

University of FloridaMarch 2002


OutlineOutline

1. Limitations with Current CLCT Pattern Numbers.

2. Improvements to Pt resolution.3. Future improvements.


Basic Design of SP LogicBasic Design of SP Logic

BXA: Allows SP to analyze track segments received out of time.EU: Test consistency of 2 track segments to share track.TAU: Links successfully extrapolated segments.FSU: Selects best 3 tracks, cancels redundant tracks.AU: Assigns Pt value and uncertainty.


Tuning Tuning bb LUTs LUTs

We will use correlation between and bend to find allowed range for in a given and bend bin

This will also allow us to further untangle low Pt from high Pt tracks.

Extrapolation Type:

MB1-ME2bend given by DT


Current Current bbCSCsCSCs

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1-1-2-3 2 3CLCT Pattern Number

Strip

These are just the CLCT Pattern Numbers.

Patterns 1 and 2 are very similar. They do not give enough bend information.

These patterns are defined for both half and di-strip track segments corresponding to high and low momentum tracks


Tuning Tuning bb LUTs LUTs

Need more half strip bend

patterns from CSCs. With the current Trigger design, we do not have enough information to establish cuts or to discriminate low from high Pt tracks.

Extrapolation Type:

ME1-ME2bend given by CSCs

bend 0< Pt<1010<Pt<2525<Pt<5050<Pt<100

Placing bend cutting on bend = ±2:•Brings trigger efficiency down to 95%•Rate only reduces by 50% for Pt<7 J. Mumford has written a set of instructions for changing the CLCT pattern numbers. So, we hope to create more patterns soon!


Current Trigger Rate from GMTCurrent Trigger Rate from GMT

Need a reduction in rate in the overlap region. Improving PT resolution will help.

DT CSC

Hannes Sakulin, PRS/Muon Meeting, 9/11/2001


Current State of PCurrent State of PTT Resolution Resolution

Residual Plot in Overlap Region from current ORCA simulation

=35%

GenTGen

TCalcT

PPP

11

Entries

Resolution = width of the Residual distribution


Improving PImproving PTT Resolution ResolutionWe are currently fitting to:

],[],[],[],[32 bPb

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b fCP

BP

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And, ],[],[],[2 bPb

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b fEP

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b=12 (left bending), =9

b=15 (straight) , =9

b from DT is rescaled from [-511, 511] range to [0,31]. has [0,63] range over 0.9-2.4 -units

So, b=15 is a straight patter, usually from high PT muons.

f3P[12,9] f3P[15,9]

|| ||

PTPT

Ex. ||=25 gives PT = 5.5 GeV

AU receives ||, then reports PT


Improving PImproving PTT Resolution Resolution

Extrapolation Type:

MB1-ME2bend given by DT

b=15, =9

b=12, =9

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||PT

PT

f3P

f2P

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f2PFrom 25k 1 events


Improving PImproving PTT Resolution Resolution

Mean Residual vs. |in Overlap Region

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GenTGen

TCalcT

PPP

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f3P f2P

f3P

f2P


Results from new FitsResults from new Fits

=24.7%

GenTGen

TCalcT

PPP

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Residual Plot in Overlap Region using new fit method

So, we have a 10% improvement over current SW model. Also, using a 2 function approach gives a 2% improvement over a single function.


ConclusionsConclusions

What’s been done in ORCA 6?• New b cuts installed for ME1 and MB1

ExtrapolationsSoon to come:

• Modify PT assignment in ORCA using new scheme. • Develop new CLCT pattern scheme.• Use the same approach as used in EU type 2-5 to

generate b cuts and improve PT resolution for other extrapolation types.

Include SP Bunch crossing analyzer in ORCA – improve efficiency [Long Term]

Sector Processor Simulation Status

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