Updates on Conversions in H Updates on Conversions in H Henso - - PowerPoint PPT Presentation

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Updates on Conversions in H Updates on Conversions in H Henso - - PowerPoint PPT Presentation

Mar 05, 2024 860 likes •1.07k views

Updates on Conversions in H Updates on Conversions in H Henso ABREU , Jean-Franois MARCHAND ( LAPP ) discussions with J,B. DE VIVIE, M. ESCALIER, L. FAYARD, F. POLCI ( LAL ), M.FANTI ( INFN ) and T. KOFFAS ( CERN ) Meeting e/

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Updates on Conversions in H Updates on Conversions in H→ →γγ γγ

Henso ABREU , Jean-François MARCHAND (LAPP)

discussions with J,B. DE VIVIE, M. ESCALIER, L. FAYARD, F. POLCI (LAL), M.FANTI (INFN) and T. KOFFAS (CERN) Meeting e/γ 21/01/2009 Meeting e/γ 27/02/2009

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ATLAS-LAL General Meeting 26/02/2009 2

Dataset used

  • mc08.106384.PythiaH120gamgam.recon.AOD.e352_s462_r541
  • 38471 Events

Introduction

Goal of this study

  • Compute the signal, secondary and fake rates for single and

double track conversions

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ATLAS-LAL General Meeting 26/02/2009 3

Remember my last presentation Double track conversions

Cuts Pt (gamma)>25 GeV itune2 + PtIsolationCone < 4GeV Ptγ γ γ γ1 >40 GeV and Pt γ γ γ γ2 > 25GeV

No TRTSA

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ATLAS-LAL General Meeting 26/02/2009 4

Remember my last presentation

Cuts Pt (gamma)>25 GeV itune2 + PtIsolationCone < 4GeV Ptγ γ γ γ1 >40 GeV and Pt γ γ γ γ2 > 25GeV

Single track conversion

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ATLAS-LAL General Meeting 26/02/2009 5

Reco to truth matching

Definitions

  • True converted photon = True e- / e+ pair with same vertex
  • False converted photon = e+ / e+ pair with different vertex for each

particle or pair of 2 other particles ( e+ / e+ , e- / e- , π± / e± , π± / π± …)

Looking up the fifteenth mother of each true particle associated to conversion vertices

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ATLAS-LAL General Meeting 26/02/2009 6

Reco to truth matching γ H e+ e- γ H γ γ e- e- e- e+ e+ e- e+ e+ e- e- e± π± “Signal” = Converted photon with true conversion coming from H γ π0 , η, ω… e+ e- e+ e+ e- e- e± π±

  • r

“Secundary” = True converted photon coming from Higgs ( after bremsstrahlung ) Or False conversion but at least one of the track is coming from Higgs “Fakes” = True converted photon not coming from Higgs OR false converted photon not coming from Higgs e+ e-

Multiple bremsstrahlung

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H e- e+ e-

Pt = 64.3 GeV Rconv,Zconv = (2.9336,-29.43) Pt = 34.4 GeV

Example of secundary converted photon from Higgs e- e+ e- e- e- e- e-

Pt = 25.9 GeV. Rconv,Zconv = (91.1,-279.14) Pt = 3.3 GeV Pt = 13.0 GeV Pt = 0.10 GeV Pt = 0.3 GeV Pt = 6.4 GeV Pt = 22.6 GeV. Rconv,Zconv = (124.25,-368.45) Pt = 9.65 GeV. Rconv,Zconv = (124.28,-368.51) Pt = 8.63 GeV. Rconv,Zconv = (127.80,-377.93) Pt = 8.353 GeV. Rconv,Zconv = (140.3,-411.36) Pt = 1.3 GeV. Rconv,Zconv = (195.28,-558.12) Pt = 5.1 GeV. Pt = 1,9 GeV. Rconv,Zconv = (140.69,-412.35)

2,3,4 1 5,6 7 1 2 3 4 5 6 7

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ATLAS-LAL General Meeting 26/02/2009 8

Single Conversion pTγ γ γ γ > 25GeV

21.11 % 3.22 % 75.67 % Fakes Secundary Signal Single track conversion

pTγ γ γ γ > 25GeV

  • Peak at 0 mainly due to fakes
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ATLAS-LAL General Meeting 26/02/2009 9

Single Conversion pTγ γ γ γ > 25GeV , isEm, isolation

21.13 % 2.82 % 76.04 % Fakes Secundary Signal Single track conversion

pTγ γ γ γ > 25GeV,isEM, isolation

  • Peak at 0 due to fakes
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ATLAS-LAL General Meeting 26/02/2009 10

Double track conversions

0.27 % 5.78 % 93.95 % Fakes Secundary Signal Double track conversions 5.17 % 6.75 % 88.08 % Fakes Secundary Signal Double track conversions

pTγ γ γ γ > 25GeV,isEM, isolation

pTγ γ γ γ > 25GeV

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ATLAS-LAL General Meeting 26/02/2009 11

Summary to each category of conversions

.2962 ± ± ± ± .0046 .2655 ± ± ± ± .0022 pTγ γ γ γ > 25GeV Double track conversions .1790 ± ± ± ± .0038 .1825 ± ± ± ± .0039 tid32800 .1616 ± ± ± ± .0019 .1646 ± ± ± ± .0019 tid26567 pTγ γ γ γ > 25GeV,isEM, isolation pTγ γ γ γ > 25GeV,isEM

Photon recovery from photon container “C2”

.1326 ± ± ± ± .0034 .0992 ± ± ± ± .0015 pTγ γ γ γ > 25GeV Double track conversions .0203 ± ± ± ± .0014 .0219 ± ± ± ± .0015 tid32800 .0183 ± ± ± ± .0007 .0190 ± ± ± ± .0007 tid26567 pTγ γ γ γ > 25GeV,isEM, isolation pTγ γ γ γ > 25GeV,isEM

Photon recovery from electron container “C12”

  • tid26567 e352s462r541 mc08

10 TeV reco 14.2.20.3

  • tid32800 e322s483r562 valid1 14TeV

reco 14.2.25.2

  • 10.000 Events
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ATLAS-LAL General Meeting 26/02/2009 12

Summary to each category of conversions

.3145 ± ± ± ± .0046 .2254 ± ± ± ± .0021 pTγ γ γ γ > 25GeV Single track conversion .2341 ± ± ± ± .0042 .2400 ± ± ± ± .0043 tid32800 .1601 ± ± ± ± .0019 .1647 ± ± ± ± .0019 tid26567 pTγ γ γ γ > 25GeV,isEM, isolation pTγ γ γ γ > 25GeV,isEM

Photon recovery from photon container “C1”

.1200 ± ± ± ± .0032 .1096 ± ± ± ± .0016 pTγ γ γ γ > 25GeV Single track conversions .0724 ± ± ± ± .0025 .0740 ± ± ± ± .0026 tid32800 .0673 ± ± ± ± .0013 .0690 ± ± ± ± .0013 tid26567 pTγ γ γ γ > 25GeV,isEM, isolation pTγ γ γ γ > 25GeV,isEM

Photon recovery from electron container “C11”

.0653 ± ± ± ± .0025 .1738 ± ± ± ± .0019 pTγ γ γ γ > 25GeV Single track conversions .0483 ± ± ± ± .0022 .0490 ± ± ± ± .0022 tid32800 .1344 ± ± ± ± .0018 .1366 ± ± ± ± .0018 tid26567 pTγ γ γ γ > 25GeV,isEM, isolation pTγ γ γ γ > 25GeV,isEM

Photon recovery from electron container “C21” with a TRT Standalone track associated

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ATLAS-LAL General Meeting 26/02/2009 13

p(1) 3 p(2) 3 u(3) 3 d(4) 3 d(6) 3 s(5) 3 H(9) 3 H(11) 2 γ(13) 1 γ(14) 1 γ(11) 3 γ(10) 3 Barcode Status

true track

reco track 2 reco track 1

e- No truth conversion found Pair e-/e- or e+/e+ ( and indirectly coming from Higgs) e+ e+ (202214) 1 e- (202215) 1

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ATLAS-LAL General Meeting 26/02/2009 14

p(1) 3 p(2) 3 d(3) 3 g(4) 3 g(6) 3 g(5) 3 H(7) 3 H(10) 2 γ(12) 1 γ(13) 1 γ(9) 3 γ(8) 3 Barcode Status Truth conversion found e+ e- γ γ γ γ(11) 3 Pt=57GeV

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ATLAS-LAL General Meeting 26/02/2009 15

  • The amount of fake double track converted photons becomes ≈ 0%

when identification / isolation cuts are applied

  • Identification / isolation cuts have no impact on “signal/ secundary/

fake” repartition for single track converted photons

  • Still ≈ 21% of fake single track converted photons after identification

/ isolation cuts

  • fake associated doesn’t mean fake photon:

Lot’s of unconverted photons are reconstructed a as single track converted photon

Conclusions

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ATLAS-LAL General Meeting 26/02/2009 16

BACKUP

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ATLAS-LAL General Meeting 26/02/2009 17

Reco to truth matching

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ATLAS-LAL General Meeting 26/02/2009 18

Signal Secondaires Fakes

Table of Conversions for dataset tid26567

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ATLAS-LAL General Meeting 26/02/2009 19

Table of Conversions for dataset tid26567

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ATLAS-LAL General Meeting 26/02/2009 20

Conversion Flag Tool : recover photons from electron container

  • Photon container :

→ Unconverted photons → Single track conversions : Flag = 1

→

Double track conversions : Flag =2

  • Electron container + ConversionFlagTool : 2 steps
  • First step :

→

Loop over the VxContainer and look at the conversions that have not been used by any Photon

→

Extrapolate the 2 tracks from the conversion in case of a double track conversion or the track from the conversion in case of a single track conversion

→

Try to match the extrapolated track to an EM cluster from the electron container

→

If matching OK :

→

If double track conversion : Flag=12

→

If single track conversion : Flag=11

  • Second step (if the electron has not been recovered by first step) :

→

If the trackParticle associated to the electron is a TRT standalone track : Flag = 21

Meeting H->gg 16/10/2008