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Update on high pT electrons study presented last meeting
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Transcript of Update on high pT electrons study presented last meeting
LPSC - Grenoble Julien MOREL 1Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Update on high pT electrons study presented last meetingUpdate on high pT electrons study presented last meeting
Julien MOREL
CSC note – diphoton dilepton
10 July 2007
LPSC - Grenoble Julien MOREL 2Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
outlineoutline
Update on the electron study presented last meeting Update on the electron study presented last meeting •Problem with the 1mm bug•Impact on linearity, resolution •Impact on selection efficiency
Preliminary results for the dilepton pairsPreliminary results for the dilepton pairs•Selection efficiency•Resolution for different part of the detector
LPSC - Grenoble Julien MOREL 3Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Data set and Athena versionData set and Athena version
We used We used ::
Athena versionAthena version : 12.0.6
ProcessProcess : Z’e+e- at 1TeV (Mll > 500 GeV), model from E6 model from E6
Cross sectionCross section = 376.5 fb
7250 Z’7250 Z’
On lOn last meeting slides, I show a bad electron linearity. In fact, using dq2, I can ast meeting slides, I show a bad electron linearity. In fact, using dq2, I can find different data-set with different TID.find different data-set with different TID.
These data-set give different results for instance for the electron linearity.These data-set give different results for instance for the electron linearity.
LPSC - Grenoble Julien MOREL 4Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
pT resolution and linearity ( Data set ( Data set tid009428tid009428 ) )
Central Resolution = (1 ± 0.04) %Linearity = (2.3 ± 0.04) %
Crack Resolution = (4.2 ± 0.05) %Linearity = (7.5 ± 0.05) %
Forward Resolution = (1.3 ± 0.01) %Linearity = (2.8 ± 0.01) %
1.4 1.4 1.5 1.5 2.5
Data SetData Set : trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid009428._00005.pool.root.1trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid009428._00004.pool.root.5trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid009428._00003.pool.root.5trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid009428._00001.pool.root.1
UsingUsing thisthis data, the data, the electronelectron linearitylinearity looks looks bad bad (~2.5%)(~2.5%).. This data set is NOT corrected for the 1mm bug This data set is NOT corrected for the 1mm bug
LPSC - Grenoble Julien MOREL 5Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
pT resolution and linearity ( Data set ( Data set tid010014tid010014 ) )
Central Resolution = (1 ± 0.02) %
Linearity = (-0.06 ± 0.02) %
Crack Resolution = (4 ± 0.5) %Linearity = (6 ± 0.05) %
Forward Resolution = (1.3 ± 0.01) %
Linearity = (0.1 ± 0.1) %
1.4 1.4 1.5 1.5 2.5
Data Set :Data Set :trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid010014._00001.pool.root.2trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid010014._00002.pool.root.3trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid010014._00004.pool.root.3trig1_misal1_csc11.005605.Zprime_ee_pythia_chi1000.merge.AOD.v12000604_tid010014._00005.pool.root.2
“Ok, I see that tid=9428 was aborted, because it lacked the correction flag. The tid=10014 should be OK, since correction have been applied.” Rashid Mehdiyev MC coordinator
LPSC - Grenoble Julien MOREL 6Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Pierre-antoine sent a list with the problematic data-setPierre-antoine sent a list with the problematic data-set
5623 Graviton (G*)->diphotons M=500 GeV5370 H++->ee/mumu5661 Excited quarks5620 Graviton (G*)->ee M=500 GeV5375 H++->tautau5371 H++->ee/mumu5373 H++->tautau6682 M(LQ) = 1200 GeV LQ -> mu c channel5622 Graviton (G*)->tautau M=500 GeV5950 WZ fusion -> W(jj)Z(ll)
if you urgently need to use one of this temporary dataset USE THE LATEST (with highest XXXX number)
Otherwise wait for the non _tid dataset which will be filled with the correct data.
5667 VBF -> WW ->jj ll5115 Drell-Yan (mumu)5114 Drell-Yan (ee)5116 Drell-Yan (tautau)5665 VBF -> WW ->jj ll5631 LQ ee-jets
5605 Z'(E6)->ee 1TeV5607 Z'(SM-like)->tautau 600 GeV5166 Z(->ll)+4j (QED diagrams)5201 ttbar5372 H++->ee/mumu5374 H++->tautau
LPSC - Grenoble Julien MOREL 7Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Impact on energy distribution for electron coming from Z’ at 1 TeVImpact on energy distribution for electron coming from Z’ at 1 TeV
E (GeV)
1 TeV Z’ induce a pic at 500 GeV
tid010014 - 1mm Bug corrected
tid009428 - 1mm Bug not corrected
Pic at 500 GeV Pic below 500 GeV
LPSC - Grenoble Julien MOREL 8Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Impact on pImpact on pT T distribution for electron coming from Z’ at 1 TeVdistribution for electron coming from Z’ at 1 TeV
pT (GeV)
Cut at 500 GeV in the dilepton invariant mass
Pic at 500 GeVPic below 500 GeV
Other distributions are not really affected and are the same as last meeting
tid010014 - 1mm Bug corrected
tid009428 - 1mm Bug not corrected
LPSC - Grenoble Julien MOREL 9Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Electron selection efficiency as a function of Electron selection efficiency as a function of and pand pT T are not very are not very
affected affected
Flat efficiency in Phi
Average efficiency value around 60%
Identification based on TRT and E/P are the main sources of loss and increase with pT
Crack around 1.4 – 1.5
Versus pT :
Versus : Versus :
LPSC - Grenoble Julien MOREL 10Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Selection efficiency as a function of Selection efficiency as a function of and pand pT T for loose and medium for loose and medium
electronelectron
Selection efficiency around 0.8 for medium electronsIn the Z’ reconstruction we will use medium electrons
LPSC - Grenoble Julien MOREL 11Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Dilepton invariant mass spectrumDilepton invariant mass spectrum
1 TeV Z’
Generation levelReconstruction level
Mll (GeV)
LPSC - Grenoble Julien MOREL 12Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Z’ Selection effeciencyZ’ Selection effeciency
Dilepton invariant mass (GeV)
Sel
ectio
n ef
fici
ency
Average efficiencyaround 50%
We use medium electronsWith opposite charge
We have to refine the selection efficiency :
add isolation and back to back criteria
LPSC - Grenoble Julien MOREL 13Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Z‘ mass resolution and linearityZ‘ mass resolution and linearity
Good reconstruction Resolution = (0.7 ± 0.02) %Linearity = (0.06 ± 0.02) %
Long tail on the right due to the crack contribution
LPSC - Grenoble Julien MOREL 14Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Resolution and linearity for different parts of the detectorResolution and linearity for different parts of the detector
Resolution = (0.82 ± 0.02) %Linearity =(0.07 ± 0.02) %
Resolution = (0.84 ± 0.03) %Linearity =(0.15 ± 0.04) %
Poor reconstruction if one of the electron goes in the crack but it concern few events
LPSC - Grenoble Julien MOREL 15Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
Twiki pageTwiki page
•I don’t show all the electron plots, but you can find them on the Twiki page :https://twiki.cern.ch/twiki/bin/view/Atlas/DilepDiphotListOfPlots
•Z’ plots have to be completed and consolidated. We will put them soon on the wiki page
•If you are using root via a compiled c++ code, you may be interested in utils.cc, utils.h (link on the Twiki page) to use the “ATLAS style macro”.
This is a compilable version of the rootlogon.c and utils.h.In your C++ code, you just have to put :
Include “utils.h”ATLAS_STYLE::SetStyle(); //…replaces the rootlogon.CgROOT->SetStyle("ATLAS");gROOT->ForceStyle();
LPSC - Grenoble Julien MOREL 16Study of high pT electrons from Z’
introduction Resolution & linearity Kinematics Efficiency Preliminary Z’ results Outlook
outlookoutlook
To do To do
Use the full available Z’ statistic.• 7250 Z’ + Z’ SSM ?
Look at the linearity and resolution dependence on pT, , . Need a lot of statistic (add the high mass DY sample).
More dilepton results coming soon (efficiency versus dilepton mass for uubar and ddbar separately) …