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JetEtmissApproved2011EtmissWithPileup

Etmiss performance under high pile conditions in 2011 data

[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 cross-section.

The lower part of the figure shows the ratio between data and MC distributions.

eps file gif file

[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 pile-up suppression for data and MC in events with Z bosons produced without jets above 20 GeV in pT. The resolution after pile-up 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.

eps file gif file

[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 pile-up 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).

eps file gif file


Major updates:
-- TancrediCarli - 01-Jun-2012

Responsible: TancrediCarli
Subject: public

[Etmiss resolution vs SumEt for number of interactions after pile-up 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 pile-up 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 pile-up. 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 pile-up suppression, averaged on the different <μ> samples, is of the order of 1 GeV.

eps file gif file

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps fig_01.eps r1 manage 64.4 K 2012-06-01 - 14:08 TancrediCarli Etmiss distribution in Z events
PNGpng fig_01.png r1 manage 21.3 K 2012-06-01 - 14:08 TancrediCarli Etmiss distribution in Z events
Unknown file formateps fig_02.eps r1 manage 14.1 K 2012-06-01 - 14:10 TancrediCarli Etmiss resolution vs Nvtx
PNGpng fig_02.png r1 manage 18.9 K 2012-06-01 - 14:11 TancrediCarli Etmiss resolution vs Nvtx
Unknown file formateps fig_03.eps r1 manage 17.3 K 2012-06-01 - 14:12 TancrediCarli Etmiss resolution as a function of SumEt for samples with different average number of interactions
PNGpng fig_03.png r1 manage 24.9 K 2012-06-01 - 14:12 TancrediCarli Etmiss resolution as a function of SumEt for samples with different average number of interactions
Unknown file formateps fig_04.eps r1 manage 15.0 K 2012-06-01 - 14:12 TancrediCarli Etmiss resolution as a function of SumEt for samples with different average number of interactions after pile-up corrections
PNGpng fig_04.png r1 manage 23.6 K 2012-06-01 - 14:13 TancrediCarli Etmiss resolution as a function of SumEt for samples with different average number of interactions after pile-up corrections
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Topic revision: r2 - 2012-06-29 - TancrediCarli
 
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