PFA on sidloi3: update Ron Cassell 4/27/10. 2 Proposed changes Calibration Tracking Extrapolation...

PFA on sidloi3: update

Ron Cassell4/27/10

2

Proposed changes

• Calibration• Tracking• Extrapolation• Subcluster finding• Muon finding• Structure

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Calibration

• Modified classes: org.lcsim.recon.cheater.QCalibrationFromData.java, org.lcsim.recon.pfa.structural.FuzzyQNeutralHadronClusterEnergyCalculator

• Minimal changes to use CalorimeterInformation class

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Tracking

• org.lcsim.recon.tracking.seedtracker.trackingdrivers.sidloi2.MainTrackingDriver.java

• Change strategy file.• org.lcsim.recon.tracking.seedtracker.Fast

Check.java• Catch exception on 2 pt circle fit.

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Extrapolation

• Add helix extrapolation to regular n-sided polyhedra. org.lcsim.util.swim.Helix.java, HelixSwimmer.java.

• Added method getDistanceToPoyhedra, returns positive pathlength of helix to intersection point with n-sided polyhedron

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getDistanceToPolyhedra• public double getDistanceToPolyhedra(double r, int nsides)• {• double mins = 9999999.;• double period = Math.abs(2.*Math.PI*radius/cosLambda);• for(int i=0;i<nsides;i++)• {• double dphi = i*2.*Math.PI/nsides;• double beta = (r - Math.cos(dphi)*xCenter - Math.sin(dphi)*yCenter)/radius;• if(Math.abs(beta) <= 1.)• {• double s1 = radius/cosLambda*(Math.asin(beta) - dphi + phi);• double s2 = radius/cosLambda*(Math.PI - Math.asin(beta) - dphi + phi);• while(s1 < 0.){s1 += period;}• while(s2 < 0.){s2 += period;}• s1 = s1%period;• s2 = s2%period;• double s = Math.min(s1,s2);• if(s1 < mins)mins = s1;• }• }• if(mins == 9999999.)return Double.NaN;• return mins;• }

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Extrapolation

• Modified extrapolation classes used in PFA to key on number of sides of the calorimeter for extrapolation methods

• Package org.lcsim.recon.pfa.identifier• FlexibleHelixExtrapolator• HelixExtrapolationResult• HelixExtrapolator• LocalHelixExtrapolator• TrackHelixExtrapolator

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Subcluster finding

• org.lcsim.recon.cluster.mipfinder. NonProjectiveMipFinder

• Try to mitigate order dependent code by at least presenting the same data in the same order.

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Muon finding

• Many problems remain, but at least fix obvious bugs and get it to execute.

• org.lcsim.recon.cluster.muonfinder• MuonFinder• SimpleMipQualityDecision• MipTrackMap

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Structure

• org.lcsim.recon.ui.ReconDriverLoi – need different tracking driver

• org.lcsim.recon.pfa.structural.SetUpPFA – pass the correct hit collections

• org.lcsim.recon.pfa.structural.ReclusterDriver – fix bug at 90 degrees in momentum calculation

• org.lcsim.recon.pfa.identifier.TrackToElectronMapMaker – bypass “# of exactly matched cell cut” for polyhedron

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Changes to sidloi3

• Compact.xml – segmentation classes of barrel calorimeters changed to extensions to allow clustering across borders.

• Most of the auxillary files are missing, need to be added. (Mainly copy from sid02). Replace hadron and photon calibration files.

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Results

• With these changes, pfa runs to completion on 9900 events of the ZZ(500) sample. (~100 events missing from SLIC output)

• Some events where tracking takes large amount of cpu.

• PFA (excluding tracking) ~ 2 times slower on sidloi3 compared to sid02

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Results

• First compare (sid02 for loi) with (sid02 with changes) to make sure we haven’t broken something.

• Look at Mass and Energy reconstruction

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entries/1 GeV

(Reconstructed - Generated) Zmass (GeV)-60 -40 -20 0 20

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sid02_newsid02_loi

sid02_loi Entries : 6449 Mean : -1.7780 Rms : 5.7117

sid02_new Entries : 6449 Mean : -1.1666 Rms : 5.7301

dM: min cos(theta) < 0.95

entries/.01

(Reconstructed - Generated)E/Generated E-0.4 -0.2 0.0 0.2 0.4 0.6

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sid02_newsid02_loi

sid02_loi Entries : 6449 Mean : -0.035439 Rms : 0.051305


dE/E: min cos(theta) < .95

rms90:

loi: 4.05

new: 4.04

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Sid02: loi - new

• No degradation, but what has changed.• Some minor improvements, bug fix in

photon finding, improved subclustering, tracking.

• Look at tracking:

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entries/.02

cos(theta) of reconstructed track-1.0 -0.5 0.0 0.5 1.0

0500

1,0001,5002,0002,5003,0003,5004,0004,5005,0005,5006,0006,500

sid02_newsid02_loi

sid02_loi Entries : 164104 Mean : -2.3075E-3 Rms : 0.72504

sid02_new Entries : 155705 Mean : -3.4028E-3 Rms : 0.70690

All events - single track cosTheta

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Sid02: loi - new

• Look at energy distributions vs particle type

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entries/5 GeV

Event E from photons (GeV)0 100 200

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500 sid02_newsid02_loi

sid02_loi Entries : 6449 Mean : 52.338 Rms : 33.209

sid02_new Entries : 6449 Mean : 52.605 Rms : 33.301

entries/5 GeV

Event E from neutral hadrons (GeV)0 100 200

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entries/5 GeV

Event E from charged particles (GeV)0 100 200 300 400

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Sid02: loi – new: conclusions

• Many changes since loi: distributions are not identical.

• However, no degradation in energy or mass resolutions.

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sidloi3

• Compare reconstructed mass and energy distributions with sid02.

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entries/1 GeV

(Reconstructed - Generated)Zmass (GeV)-50 0 50

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sidloi3sid02_new sid02_new

Entries : 6449 Mean : -1.1666 Rms : 5.7301

sidloi3 Entries : 6393 Mean : 0.21611 Rms : 6.6897

dM: min cos(theta) < .95entries/.01

(Reconstructed - Generated)E/Generated E-0.5 0.0 0.5 1.0 1.5

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sidloi3sid02_new


sidloi3 Entries : 6393 Mean : -0.014323 Rms : 0.069309

dE/E: min cos(Theta) < .95

rms90:

sid02: 4.04

sidloi3:4.42

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sidloi3

• Tails of mass and energy distributions extend much farther in sidloi3.

• ~10% worse mass resolution using rms90.• Not great, not crazy either.• A few more plots.

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entries/.5 GeV

dM (GeV)-20 -15 -10 -5 0 5 10 15 20

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gauss_1gausssidloi3sid02_new



gauss amplitude : 244.78±4.19 mean : -1.1074±0.06467 sigma : 5.0976±0.0590 χ² : 2.1323

gauss_1 amplitude : 225.09±3.77 mean : -0.040366±0.071558 sigma : 5.4515±0.0597 χ² : 2.1135

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Event E from photons (GeV)0 100 200

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Event E from neutral hadrons (GeV)0 100 200

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Event E from charged particles (GeV)0 100 200 300 400

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sidloi3: conclusion• Many problems have been addressed to get the

current algorithm to run on sidloi3.• Still many unresolved problems related to

performance.• Propose to commit all the changes to CVS, and

use as a starting point for performance studies.• Need Christoph to run on qq(100,200,350,500)

events to verify no degradation in sid02 performance.

• Need SLIC on sidloi3 for same events to study performance.

PFA on sidloi3: update Ron Cassell 4/27/10. 2 Proposed changes Calibration Tracking Extrapolation...

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