Difference: JetEtmissApproved2011EtmissWithPileup (1 vs. 2)

Revision 22012-06-29 - TancrediCarli

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Revision 12012-06-01 - TancrediCarli

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JetEtmissApproved2011EtmissWithPileup

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Etmiss performance under high pile conditions in 2011 data

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[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.

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[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.

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[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).

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

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[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.

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META FILEATTACHMENT attachment="fig_01.eps" attr="" comment="Etmiss distribution in Z events" date="1338552486" name="fig_01.eps" path="fig_01.eps" size="65927" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_01.png" attr="" comment="Etmiss distribution in Z events" date="1338552520" name="fig_01.png" path="fig_01.png" size="21834" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_02.eps" attr="" comment="Etmiss resolution vs Nvtx" date="1338552655" name="fig_02.eps" path="fig_02.eps" size="14412" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_02.png" attr="" comment="Etmiss resolution vs Nvtx" date="1338552675" name="fig_02.png" path="fig_02.png" size="19343" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_03.eps" attr="" comment="Etmiss resolution as a function of SumEt for samples with different average number of interactions" date="1338552726" name="fig_03.eps" path="fig_03.eps" size="17735" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_03.png" attr="" comment="Etmiss resolution as a function of SumEt for samples with different average number of interactions" date="1338552748" name="fig_03.png" path="fig_03.png" size="25531" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_04.eps" attr="" comment="Etmiss resolution as a function of SumEt for samples with different average number of interactions after pile-up corrections" date="1338552778" name="fig_04.eps" path="fig_04.eps" size="15395" user="tcarli" version="1"
META FILEATTACHMENT attachment="fig_04.png" attr="" comment="Etmiss resolution as a function of SumEt for samples with different average number of interactions after pile-up corrections" date="1338552792" name="fig_04.png" path="fig_04.png" size="24166" user="tcarli" version="1"
 
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