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Photon hadron correlation task list 

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 QA calorimeter : Dana (taks 1), Xiangrong
 Run selection with PHOS triggered : Renzhuo (task 1)

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 QA calorimeter : Dana (taks 1), Xiangrong
 Run selection with PHOS triggered : Renzhuo (task 1)



 QA TPC : What is the TPC performance? Check RTC / run


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 pp charged track selection, ESDAOD : Dana (task 2)

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 pp (PbPb) charged track selection, ESDAOD : Dana (task 2)



 fake tracks at high pt
 find best selection criteria ( hybrid tracks as jet and correlation groups ?)
 define track momentum ranges and acceptance
 We should define the region in eta where we want to correlate with tracks
 Is a maximum pT cut needed to avoid fakes ?
 pp trigger particle selection


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 study the selection of the trigger particle
 trigger region and associated pt bins: Nicolas (task2)
 Correlation ranges in xt and zt

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 study the selection (pt, eta ranges) of the trigger particle
 trigger region and associated pt bins: Nicolas (task2)
 Correlation ranges in xE and zT




 pT reach, fake tracks at high pT
 MC productions


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 EMCal clusterization (for PbPb, studies to be done)
 Pi0 analysis and shower shape : Gustavo (done)
 Photons : Gustavo (done)
 Pi0/Eta event by event via invariant mass : V1+unfolding needs a final check.

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 Selection of available MC runs suitable for correlation studies
 EMCal clusterization (for PbPb, more studies to be done)
 Pi0 analysis : V1+unfolding needs a final check Gustavo (next week)



 Pi0/Eta event by event via cluster splitting with V1 : check (?)


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 EMCal charged clusters vetoing (further checks with data driven cluster selection in PbPb are needed)
 Neutral meson identification event by event via pair cuts : Gustavo (done),

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 EMCal charged clusters vetoing
 pp : Gustavo (done),
 PbPb : further checks with data driven cluster selection in PbPb are needed
 Neutral meson identification event by event via pair cuts : Tuning needed
 check purity of mass cut range, variation with energy might be needed




 the aperture angle need more checks
 Neutral meson identification via cluster splitting in EMCAL


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 for E< 20 GeV: Gustavo (done)
 Splitting at high energy (E>20 GeV) of clusters might introduce too much contamination from wrong splits. It needs a careful look

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 Need realistic MC for final assesment
 for E< 20 GeV: Gustavo (done)
 Splitting at high energy (E>20 GeV) of clusters might introduce too much contamination from wrong splits. It needs a careful look


 Photon selection / shower shape


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 MC tuning for photon pid: Nicolas (task 1), Mauro (task 1)

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 MC tuning for photon pid: Nicolas (task 1), Mauro (task 1)




 Cut on pt of particles in cone
 a la Mauro : sum of the energy in trigger cone and background region, subtract and apply a cut on the remaining energy
 What MC can be used for PID studies or correlation studies ?
 Need to revise, adapt to the new mixing frame, or to use a "hand made mixing" like for pi0 analysis. If needed...
 isolation


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 Isolation with track, clusters or tracks+clusters or just cells : Nicolas (task 3)
 quantify impact of the acceptance (density method) : Nicolas

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 Isolation with track, clusters or tracks+clusters or just cells : Nicolas (task 3)
 quantify impact of the acceptance (density method) : Nicolas




 what is the effect on the efficiency
 Effect of fiducial cuts on isolation decay/pi0
 how to estimate systematic errors


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 impact of QA on isolation Alexis
 isolation with method 2 : Mauro (task 2)

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 impact of QA on isolation Alexis
 isolation with method 2 : Mauro (task 2)




 Systematic studies to be (re)done in pp (and PbPb separatedly) using data driven methods (decay photon, or pi0 cluster identification) or MC (embedded).
 Do we need to apply flow corrections? If we concentrate in high pT maybe not.
 Converted photon id (needed ?)


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 what particles are in the cone ? good clusters all have a track matched ?
 Efficiency
 Pi0, eta and decay photon tagging
 check systematics and efficiency of EMCal cuts


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 efficiency, purity and background estimation : Xiangrong (task 1)

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 efficiency, purity and background estimation : Xiangrong (task 1)

 

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 Azimuthal eff correction : Dana (task 3)

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 Azimuthal eff correction : Dana (task 3)


 Embedding :This might need of a common production and discussion with other groups (PWGJE, PWGCF)
 Background and systematic uncertainties
 trigger : decay and hadron contamination
 need simulations with realistic pi0 spectrum
 how to propagate the estimated background


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 xt, zt; how to estimate syst uncertainties due to background and underlying event subtraction : Nicolas (task 4 : xE, zT systematic errors, contamination estimation)

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 xt, zt; how to estimate syst uncertainties due to background and underlying event subtraction : Nicolas (task 4 : xE, zT systematic errors, contamination estimation)



 delta phi
 pedestal subtraction : di hadron paper uses 3 different approaches. Avoid mixed events unless non uniform phi of tracks
 clustertrack correlation eff estimation





 Contribution to flow ?
 track eff : check etaphi eff for diff pt and not integrated
 how to estimate syst uncertainty due to background ?


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 nonPi0 band correlations vs pi0 band : Hongsheng (task 1) and Xiangrong (task 2)

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 nonPi0 band correlations vs pi0 band : Hongsheng (task 1) and Xiangrong (task 2)


 Comparison to simulation, to 2.76 pp data ?
photon spectra 

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 Triggered spectra normalization : Alexis (task 2)
 Direct photon predictions : Alexis (task 2)
 Direct photon INCNLO predictions : Hugues (task 1)
 QA : Marie (task 1)
 time cuts : Marie (task 2)

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 Triggered spectra normalization : Alexis (task 2)
 Direct photon predictions : Alexis (task 2)
 Direct photon INCNLO predictions : Hugues (task 1)
 QA : Marie (task 1)
 time cuts : Marie (task 2)


 CatherineSilvestre  06Mar2012
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