Single Particle Studies

7/31/2019 Single Particle Studies

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MotivationInternational Large Detector @ the ILC

Production, Simulation and ReconstructionAnalysis and Results

Conclusions

Single Particle Response Studiesusing particle flow reconstruction on a simulation of the ILD

detector at the ILC

Marco A. Carrasco-Lizarraga

University of Kansas

September 20, 2011

Marco A. Carrasco-Lizarraga (University of Kansas) KU HEP Seminar 1 / 38
http://find/http://goback/


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Conclusions

Outline

1 Motivation

2 International Large Detector @ the ILC

3 Production, Simulation and Reconstruction

4 Analysis and Results

5 Conclusions

http://find/


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Conclusions

Introduction

Some of the motivation behind theILCs scientific programme

http://find/


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Conclusions

Physics @ ILC: Higgs

The precise determination of the properties of the Higgs boson isone of the main goals of the ILC. Of particular importance are itsmass, mH, the total production cross section, (e

+e HZ), andthe Higgs branching ratios.


M i i


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Conclusions

Physics @ ILC: Top

At the ILC, the top mass, mt, and top width, t, can bedetermined with high precision. The measurement of these fromthe direct reconstruction ofe+e tt events is studied. Also, thetop quark forward-backward asymmetry provides a potentiallyinteresting test of the SM.


M ti ti
http://find/


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Conclusions

Physics @ ILC: Strong EWSB

If Strong Electroweak Symmetry Breaking is realised in nature, thestudy ofWW-scattering processes is particularly important. At theILC, the W+W W+W and W+W ZZ vertices can beprobed via the processes e+e eeqqqq where the final statedi-jet masses are from the decays of two W-bosons or two

Z-bosons.


Motivation


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Conclusions

Physics @ ILC: Strong EWSB

The reconstructed di-jet mass

distributions for the best jet-pairing

in selected eeWW (blue) and

eeZZ (red) events ats= 1TeV

Distributions of the average

reconstructed di-jet mass,

(mij + mBkl)/2, for the best

jet-pairing for eeWW (blue) and

eeZZ (red) eventsMarco A. Carrasco-Lizarraga (University of Kansas) KU HEP Seminar 7 / 38

Motivation


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Conclusions

Jet-Energy Resolution

One of the most direct measures of detector performance at theILC is the jet-energy resolution. Precise di-jet mass reconstructionand separation of hadronically decaying W and Z bosons areessential for many physics channels. The ultimate jet energyresolution is achieved when every particle in an event, charged andneutral, is measured with the best possible precision and accuracy.

Ejet = Echarged[65%] + Ephotons[25%] + Eneutralhadrons[10%]


Motivation
http://find/


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Conclusions

International Linear Collider

e+

e

collisions, Instant Luminosity of 1034

cm2

s1

Energy of up tos=500 GeV, upgradable to 1 TeV

An acceleration gradient of 31.5 MV/m, using 16ksuperconducting accelerating cavities (at 2 K) made of pureniobium

2 detectors based on complementary technologies: ILD and SiDMarco A. Carrasco-Lizarraga (University of Kansas) KU HEP Seminar 9 / 38

Motivation


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Conclusions

ILD Detector Systems

Person

A multi-layer pixel-vertexdetector (VTX)

Central tracking with Time

Projection Chamber,supplemented with Sidetectors

Electromagnetic andhadronic calorimeters

3.5 Tesla superconductingcoil

Forward and muon detectors(iron Yoke)


Motivation
http://find/


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International Large Detector @ the ILCProduction, Simulation and Reconstruction

Analysis and ResultsConclusions

ILD Calorimeters

ECAL: Interleaved layers ofabsorbing material (tungsten)and position sensors, which could

be silicon pixel pads orscintillator plastic strips.

HCAL: Steel absorber materialand an active medium, which

could be scintillator tiles orgaseous devices.


Motivation


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Particle Flow

Particle Flow is a calorimetric method for reconstructing jet energies.

Traditionally, jet energies have been

measured by taking the sum of the

energies deposited in the hadronic and

electromagnetic calorimeters.

The particle flow approach takes a

highly granular calorimetry system

and combines it with the trackingdevices to measure the energy and

momentum of every visible particle.

M.A. Thomson, Particle Flow Calorimetry and the PandoraPFA

Algorithm. Nucl. Instrum. Meth. A 611, 25 (2009).


Motivation
http://find/


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Particle Flow

The energy of charged particles is

measured by the tracking detectors;

that of photons by the electromagneticcalorimeter. The hadronic calorimeter

is then used only to measure the

energy of neutral hadrons.

The reduced dependence on thehadronic calorimeter will lead to an

unprecedented jet energy resolution.


Motivation@ C
http://find/


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CALICECAlorimeter for LInear Collider Experiment

A high granularity calorimeter system optimised for the particleflow measurement of multi-jet final states at the ILC running, with

centre-of-mass energy between 90 GeV and 1 TeV.

The unprecedented granularity of the CALICE calorimeterprototype provides an opportunity to test the Particle Flow

concept. Work is in progress to check the output quality of thePFA programs. Due to large amount of test beam data, itbecomes possible to use real events instead of simulated ones asinput information for these programs.


MotivationI i l L D @ h ILC
http://find/


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CALICE Test Beam @ Fermilab, April/May 2011


MotivationI t ti l L D t t @ th ILC
http://find/


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SiW-ECAL + D-HCAL events

Beam momentum 20GeV/c Beam momentum 32GeV/c


http://find/


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Production, Simulation,Reconstruction and Analysis @ KU




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Particle Generation

Used java DiagnosticEventGenerator to produce single particlestdhep files for:

Charged: e, , , K, p and their anti-particles,EM neutrals: and 0,

Neutral hadrons: K0L , n and n,

V0s: K0S, and .

Generated 10k events of each MC particle, for each of thefollowing kinetic energies: 0.1, 0.2, 0.5, 1.0, 2.0. 5.0, 10.0, 20.0,50.0 and 100.0 GeV.


http://find/


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Simulation and Reconstruction

The stdhep files were then run through a Mokka Simulation

of the ILD detector in the barrel region (/4), generating slcio files.

These in turn were run through Marlin Reconstruction, creatingnew slcio files to be analized with the tools we have developed.


http://find/


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Reconstructed Energy for and e at low energies

Entries 10000

Mean 0.2349

RMS 0.06241

Reconstructed PFO Energy (GeV)0 1 2 3 4

NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 0.2349

RMS 0.06241

Entries 10000

Mean 0.3638RMS 0.1373

Entries 10000

Mean 0.8694RMS 0.3675

Entries 10000Mean 1.394

RMS 0.4067

Entries 10000

Mean 2.277RMS 0.4243

GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of-10k

Low Energy Muons

Entries 10000

Mean 0.1369

RMS 0.1082


NumberofPFOs

0

2000

4000

6000

Entries 10000

Mean 0.1369

RMS 0.1082

Entries 10000

Mean 0.2714RMS 0.07584

Entries 10000

Mean 0.6879RMS 0.2097


RMS 0.4006

Entries 10000

Mean 2.043

RMS 0.2869

GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of-

10k e

Low Energy Electrons


http://goback/http://find/http://goback/http://find/http://find/http://goback/


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gProduction, Simulation and Reconstruction


Reconstructed Energy for and e at high energies

Entries 10000

Mean 6.619

RMS 2.788

Reconstructed PFO Energy (GeV)20 40 60 80 100 120

NumberofPFOs

0

2000

4000

6000

Entries 10000

Mean 6.619

RMS 2.788

Entries 10000

Mean 10.2RMS 0.9802

Entries 10000

Mean 20.09RMS 1.499


RMS 5.202

Entries 10000

Mean 98.41

RMS 12.26

GeVs at generation100and50,20,10,5with a KE of-10k

High Energy Muons

Entries 10000

Mean 5.051

RMS 0.5203


NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 5.051

RMS 0.5203

Entries 10000

Mean 10.01RMS 0.2869

Entries 10000

Mean 20.04RMS 0.529


RMS 0.9934

Entries 10000

Mean 99.32

RMS 2.813

GeVs at generation100and50,20,10,5with a KE of-

10k e

High Energy Electrons




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Conclusions

Reconstructed Energy for e and at low energies

Entries 10000

Mean 0.1369

RMS 0.1082


NumberofPFOs

0

2000

4000

6000

Entries 10000

Mean 0.1369

RMS 0.1082

Entries 10000

Mean 0.2714RMS 0.07584

Entries 10000

Mean 0.6879RMS 0.2097


RMS 0.4006

Entries 10000

Mean 2.043

RMS 0.2869


10k e

Low Energy Electrons

Entries 10000

Mean 0.04203

RMS 0.06502


NumberofPFOs

0

2000

4000

6000

Entries 10000

Mean 0.04203

RMS 0.06502

Entries 10000

Mean 0.1734RMS 0.09688

Entries 10000

Mean 0.4835RMS 0.1301


RMS 0.1837

Entries 10000

Mean 1.981

RMS 0.2463

GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of10k

Low Energy Photons


http://find/http://find/http://find/


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Conclusions

Reconstructed Energy for e and at high energies

Entries 10000

Mean 5.051

RMS 0.5203


NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 5.051

RMS 0.5203

Entries 10000

Mean 10.01

RMS 0.2869

Entries 10000

Mean 20.04RMS 0.529


RMS 0.9934

Entries 10000

Mean 99.32

RMS 2.813


10k e

High Energy Electrons

Entries 10000

Mean 4.971

RMS 0.4002


NumberofPFOs

0

1000

2000

3000

4000

5000

Entries 10000

Mean 4.971

RMS 0.4002

Entries 10000

Mean 9.986

RMS 0.6221

Entries 10000

Mean 20.06RMS 0.9483


RMS 1.74

Entries 10000

Mean 101.4

RMS 2.965

GeVs at generation100and50,20,10,5with a KE of10k

High Energy Photons



P d i Si l i d R i


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Conclusions

Reconstructed Energy for and + at low energies

Entries 10000

Mean 0.2349

RMS 0.06241


NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 0.2349

RMS 0.06241

Entries 10000

Mean 0.3638

RMS 0.1373

Entries 10000

Mean 0.8694RMS 0.3675


RMS 0.4067

Entries 10000

Mean 2.277RMS 0.4243


Low Energy Muons

Entries 10000

Mean 0.2476

RMS 0.05736


NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 0.2476

RMS 0.05736

Entries 10000

Mean 0.3864

RMS 0.134

Entries 10000

Mean 0.8826RMS 0.3519


RMS 0.3388

Entries 10000

Mean 2.185

RMS 0.2748

GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of+10k

Low Energy Pions



P d ti Si l ti d R t ti


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Conclusions

Reconstructed Energy for and + at high energies

Entries 10000

Mean 6.619

RMS 2.788


NumberofPFOs

0

2000

4000

6000

Entries 10000

Mean 6.619

RMS 2.788

Entries 10000

Mean 10.2

RMS 0.9802

Entries 10000

Mean 20.09RMS 1.499


RMS 5.202

Entries 10000

Mean 98.41

RMS 12.26


High Energy Muons

Entries 10000

Mean 5.189

RMS 0.496


NumberofPFOs

0

2000

4000

6000

8000

Entries 10000

Mean 5.189

RMS 0.496

Entries 10000

Mean 10.19

RMS 0.5423

Entries 10000

Mean 20.26RMS 0.8281


RMS 2.105

Entries 10000

Mean 100.9

RMS 4.505

GeVs at generation100and50,20,10,5with a KE of+10k

High Energy Pions



Production Simulation and Reconstruction


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Conclusions

Reconstructed Energy for Charged Particles

Entries 10000Mean 0.2476RMS 0.05736


NumberofPFOs

0

2000

4000

6000

8000






GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of+10k



NumberofPFOs

0

1000

2000

3000

4000






GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of+

10k K



NumberofPFOs

0

2000

4000

6000

8000






GeVs at generation2.0and1.0,0.5,0.2,0.110k p with a KE of

Pions Kaons Protons


Reconstructed PFO Energy (GeV)

20 40 60 80 100 120

NumberofPFOs

0

2000

4000

6000

8000






GeVs at generation100and50,20,10,5with a KE of+10k



20 40 60 80 100 120

NumberofPFOs

0

2000

4000

6000

8000





Entries 10000Mean 101RMS 4.487

GeVs at generation100and50,20,10,5with a KE of+

10k K



20 40 60 80 100 120

NumberofPFOs

0

2000

4000

6000

8000






GeVs at generation100and50,20,10,510k p with a KE of



http://goback/http://find/http://goback/http://find/http://goback/http://find/http://goback/http://find/http://goback/http://find/http://goback/http://find/http://find/http://goback/


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Conclusions

Reconstructed Energy for 0

Entries 10000

Mean 0.1475

RMS 0.1032


0 1 2 3 4

Nu

mberofPFOs

0

500

1000

1500

2000

Entries 10000

Mean 0.1475

RMS 0.1032

Entries 10000

Mean 0.2653

RMS 0.1209

Entries 10000

Mean 0.5839RMS 0.1536


RMS 0.2005

Entries 10000

Mean 2.103

RMS 0.2634


Low Energy Pion0s

Entries 10000

Mean 5.095

RMS 0.4047


20 40 60 80 100 120

Nu

mberofPFOs

0

1000

2000

3000

4000

5000

Entries 10000

Mean 5.095

RMS 0.4047

Entries 10000

Mean 10.1

RMS 0.6009

Entries 10000

Mean 20.15RMS 0.9364


RMS 1.664

Entries 10000

Mean 101.3

RMS 2.974


High Energy Pion0s





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Conclusions

Reconstructed Energy for Neutral Hadrons



EventsperBin

1

10

210

310






GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of0

L10k K

Entries 10000Mean0.0001214RMS 0.007415


Events

perbin

1

10

210

310

410

Entries 10000Mean0.0001214RMS 0.007415

Entries 10000Mean 0.00656RMS 0.04863




GeVs at generation2.0and1.0,0.5,0.2,0.110k n with a KE of



EventsperBin

0

100

200

300

400






GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE ofn10k

Klong0s Neutrons Antineutrons



20 40 60 80 100 120

Events

perbin

0

500

1000

1500

2000






GeVs at generation100and50,20,10,5with a KE of0

L10k K



0 50 100

NumberofPFOs

0

500

1000

1500

2000






GeVs at generation100and50,20,10,510k n with a KE of



20 40 60 80 100 120 140

Events

perbin

0

500

1000

1500

2000





Entries 10000Mean 101RMS 11.49

GeVs at generation100and50,20,10,5with a KE ofn10k



Production, Simulation and Reconstruction


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Conclusions

Reconstructed Energy for K0L and n at high energies

Entries 10000

Mean 4.9

RMS 1.305


20 40 60 80 100 120

Events

perbin

0

500

1000

1500

2000

Entries 10000

Mean 4.9

RMS 1.305

Entries 10000

Mean 9.958

RMS 2.11

Entries 10000

Mean 21.4RMS 2.898


RMS 5.883

Entries 10000

Mean 99.1

RMS 13.22


L10k K

High Energy Klong0s

Entries 10000

Mean 4.401

RMS 1.246


0 50 100

Nu

mberofPFOs

0

500

1000

1500

2000

Entries 10000

Mean 4.401

RMS 1.246

Entries 10000

Mean 8.864

RMS 1.713

Entries 10000

Mean 19.93RMS 2.815


RMS 5.249

Entries 10000

Mean 100.2

RMS 11.08


High Energy Neutrons





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,Analysis and Results

Conclusions

Reconstructed Energy for V0s


Reconstructed PFO Energy (GeV)0 2 4 6

EventsperBin

0

500

1000

1500






GeVs at generation2.0and1.0,0.5,0.2,0.1with a KE of0

S10k K


Reconstructed PFO Energy (GeV)0 2 4 6

EventsperBin

0

1000

2000

3000

4000









EventsperBin

0

100

200

300







Kshort0s Lambdas Antilambdas



20 40 60 80 100 120 140

Events

perbin

0

2000

4000

6000







S10k K



20 40 60 80 100 120 140

Events

perbin

0

1000

2000

3000

4000









50 100 150

Events

perbin

0

1000

2000

3000

4000











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Reconstructed Energy for K0S and at high energies

Entries 10000

Mean 5.546

RMS 0.6324


20 40 60 80 100 120 140

Events

perbin

0

2000

4000

6000

Entries 10000

Mean 5.546

RMS 0.6324

Entries 10000

Mean 10.57

RMS 1.068

Entries 10000

Mean 20.71RMS 2.063


RMS 4.886

Entries 10000

Mean 100.4

RMS 11.1


S10k K

High Energy Kshort0s

Entries 10000

Mean 5.525

RMS 1.242


20 40 60 80 100 120 140

Events

perbin

0

1000

2000

3000

4000

Entries 10000

Mean 5.525

RMS 1.242

Entries 10000

Mean 10.4

RMS 1.709

Entries 10000

Mean 20.32RMS 2.476


RMS 5.931

Entries 10000

Mean 99.29

RMS 11.94


High Energy Lambda





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V0 separation

Charged NeutralK0S +(69%) K0S 00(30%)

p(63.9%)

n0(35.8%)

Lambda example:Protons Neutrons Lambdas

Entries 10000

Mean 5.874

RMS 0.4312


NumberofP

FOs

0

2000

4000

6000

8000

Entries 10000

Mean 5.874

RMS 0.4312

Entries 10000

Mean 10.91RMS 0.6124

Entries 10000

Mean 20.98RMS 0.8809


RMS 1.69

Entries 10000

Mean 101.6

RMS 3.487

GeVs at generation100and50,20,10,510k p with a KE of

Entries 10000

Mean 4.401

RMS 1.246

Reconstructed PFO Energy (GeV)0 50 100

NumberofP

FOs

0

500

1000

1500

2000

Entries 10000

Mean 4.401

RMS 1.246

Entries 10000

Mean 8.864RMS 1.713

Entries 10000

Mean 19.93RMS 2.815


RMS 5.249

Entries 10000

Mean 100.2

RMS 11.08


Entries 10000

Mean 5.525

RMS 1.242

Reconstructed PFO Energy (GeV)20 40 60 80 100 120 140

Eventspe

rbin

0

1000

2000

3000

4000

Entries 10000

Mean 5.525

RMS 1.242

Entries 10000

Mean 10.4RMS 1.709

Entries 10000

Mean 20.32RMS 2.476


RMS 5.931

Entries 10000

Mean 99.29

RMS 11.94



MotivationInternational Large Detector @ the ILCProduction, Simulation and Reconstruction

A l i d R l
http://goback/http://find/http://goback/http://find/http://goback/http://find/http://find/http://goback/


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Energy Bias Comparisons

(GeV)beamT-110 1 10

210

beam

)/E

beam

-E

reco

(E

-0.2

0

0.2

0.4

0.6

pand-

K,-,-,-eComparison of the negatively charged particles:

Negatively Charged

(GeV)beamT-1

10 1 102

10

beam

)/T

beam

-T

reco

(E

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0andComparison of

Neutrals



A l i d R lt


34/41


Energy Bias Comparisons

(GeV)beamT-110 1 10 210

beam

)/T

beam

-T

reco

(E

-1

0

1

2

3

nandn,0LKComparison of hadronic neutrals:

Hadronic Neutrals

(GeV)beamT-110 1 10 210

beam

)/T

beam

-T

reco

(E

0

1

2

3

and,0sKComparison of V0 neutrals:

V0 Neutrals



Anal sis and Res lts
http://find/


35/41


Resolution Comparisons

(GeV)beamT-110 1 10

210

beam

/T

reco

E

0

1

2

3

4

pand-

K,-,-,-eComparison of the negatively charged particles:

Negatively Charged

(GeV)beamT-1

10 1 102

10

beam

/T

reco

E

0

0.2

0.4

0.6

0.8

1

0andComparison of

Neutrals



Analysis and Results


36/41


Resolution Comparisons

(GeV)beamT-110 1 10 210

beam

/T

reco

E

0

1

2

3

4

5

nandn,0LKComparison of hadronic neutrals:

Hadronic Neutrals

(GeV)beamT-110 1 10 210

beam

/T

reco

E

0

2

4

6

and,0sKComparison of V0 neutrals:

V0 Neutrals





37/41


Conclusions

We find that the energies of photons and pi0s arereconstructed robustly with a rather Gaussian response

function.Charged particles are reconstructed with better precision, butexhibit long non-Gaussian tails particularly at low pT where itis quite probable to double-count track-based and calorimeterenergy due to curling tracks.

The neutral hadron response functions are broad as expectedand show substantial particle-type dependent differences.





38/41


Work in Progress

Angular studies in theta and phi.V0 separation into the neutral and charged channels.

Test response to different hadronic shower models.



39/41

Reconstructed Energy for Charged Particles

Electrons Muons



NumberofPFOs

0

2000

4000

6000







10k e



NumberofPFOs

0

2000

4000

6000

8000









NumberofPFOs

0

2000

4000

6000

8000







10k e



NumberofPFOs

0

2000

4000

6000







http://goback/http://find/http://goback/http://find/http://goback/http://find/http://goback/http://find/http://find/http://goback/


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Reconstructed Energy for EM Neutrals

Photons Pion0s

Entries 10000Mean 0.04203RMS 0.06502


NumberofPFOs

0

2000

4000

6000

Entries 10000Mean 0.04203RMS 0.06502








NumberofPFOs

0

500

1000

1500

2000









NumberofPFOs

0

1000

2000

3000

4000

5000









NumberofPFOs

0

1000

2000

3000

4000

5000







http://goback/http://find/http://goback/http://find/http://goback/http://find/http://goback/http://find/http://find/http://goback/


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BACKUP: Versions Used.

ilcsoft vMarlinReco v

PandoraPFANew tag

MarlinPandoraFull tag


Single Particle Studies

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