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

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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.

eps file gif file

Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
eps	fig_01.eps	r1	manage	64.4 K	2012-06-01 - 14:08	TancrediCarli	Etmiss distribution in Z events
png	fig_01.png	r1	manage	21.3 K	2012-06-01 - 14:08	TancrediCarli	Etmiss distribution in Z events
eps	fig_02.eps	r1	manage	14.1 K	2012-06-01 - 14:10	TancrediCarli	Etmiss resolution vs Nvtx
png	fig_02.png	r1	manage	18.9 K	2012-06-01 - 14:11	TancrediCarli	Etmiss resolution vs Nvtx
eps	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
png	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
eps	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
png	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

Topic revision: r2 - 2012-06-29 - TancrediCarli

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