JetEtmissApproved2011EtmissWithPileup
[MET distribution in Z events]
Distribution of missing ET as measured in a data sample of Z>μμ events.
The expectation from Monte Carlo simulation is superimposed and normalized to data, after
each MC sample is weighted with its corresponding crosssection.
The lower part of the figure shows the ratio between data and MC distributions.

[Etmiss resolution vs number of reconstructed vertices]
Resolution of x and y missing ET components as a function of the number of primary vertices without pileup suppression for data and MC in events with Z bosons produced without jets above 20 GeV in pT. The resolution after pileup suppression, based on the ratio of the sum pT of the tracks associated to the primary vertex and all tracks not associated to reconstructed objects, is shown for MC simulation.

[Etmiss resolution vs SumEt for number of interactions]
Resolution of x and y missing ET component as a function of the scalar sum of transverse energies of all the calorimeter energy depositions and muons(SumET) without pileup suppression. Simulated Z>μμ events with different values of the average number of interactions per bunch crossing (<μ>) are shown. The numbers in the legend result from the fit of the resolutions parameterization as a function of sqrt(SumET).

Major updates:
 TancrediCarli  01Jun2012
Responsible: TancrediCarli
Subject: public
[Etmiss resolution vs SumEt for number of interactions after pileup interactions]
Resolution of x and y missing ET components as a function of the scalar sum of transverse energies of all the calorimeter energy depositions and muons (SumET), after pileup suppression, based on the ratio of the sum pT of the tracks associated to the primary vertex and all tracks.
The SumET on the abscissa is not corrected for pileup. Simulated Z>μμ events with different values of the average number of interactions per bunch crossing(<μ>) are shown. The numbers in the legend result from the fit of the resolutions parameterization as a function of sqrt(SumET).
The worsening of the bias in Etmiss response for pTZ=40 GeV after pileup suppression, averaged on the different <μ> samples, is of the order of 1 GeV.

I  Attachment  History  Action  Size  Date  Who  Comment 

eps  fig_01.eps  r1  manage  64.4 K  20120601  14:08  TancrediCarli  Etmiss distribution in Z events 
png  fig_01.png  r1  manage  21.3 K  20120601  14:08  TancrediCarli  Etmiss distribution in Z events 
eps  fig_02.eps  r1  manage  14.1 K  20120601  14:10  TancrediCarli  Etmiss resolution vs Nvtx 
png  fig_02.png  r1  manage  18.9 K  20120601  14:11  TancrediCarli  Etmiss resolution vs Nvtx 
eps  fig_03.eps  r1  manage  17.3 K  20120601  14:12  TancrediCarli  Etmiss resolution as a function of SumEt for samples with different average number of interactions 
png  fig_03.png  r1  manage  24.9 K  20120601  14:12  TancrediCarli  Etmiss resolution as a function of SumEt for samples with different average number of interactions 
eps  fig_04.eps  r1  manage  15.0 K  20120601  14:12  TancrediCarli  Etmiss resolution as a function of SumEt for samples with different average number of interactions after pileup corrections 
png  fig_04.png  r1  manage  23.6 K  20120601  14:13  TancrediCarli  Etmiss resolution as a function of SumEt for samples with different average number of interactions after pileup corrections 