Difference: JetEtmissApproved2011PileupOffsetAndJVF (1 vs. 3)

Revision 32012-01-06 - ArielSchwartzman

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 [Jet Offset in data (I)]

Calorimeter jet pT as a function of number of reconstructed primary vertices (NPV), for the central pseudo-rapidity region. Calorimeter jets reconstructed at the EM scale are associated to track jets in bins of pT. Each point shows the most probable value of calorimeter jet pT, for a specific pT (track jet) range and NPV.

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[Jet Offset in data (II)]

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 [Jet Offset at high luminosity]

A data set with an integrated luminosity of 0.4 pb-1 and approximately 30 interactions per bunch crossing. Reconstructed tracks originating from the chosen primary vertex were matched within &DeltaR < 0.6 to anti-kt R = 0.6 topo-cluster jets. The sum of the pT of the matched tracks is insensitive to pile-up and correlated with the true jet pT. In each bin of matched track pT, we see clearly the dependence of the calorimeter jet pT on in-time pile-up, as described by the number of reconstructed primary vertices (NPV). This dependence remains linear up to at least NPV = 30, and it is in quantitative agreement with the results of similar studies performed in 2011 data with significantly less pile-up.

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 [Jet Vertex Fraction Discriminant]
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The jet vertex fraction (JVF) quantifies the fraction of track transverse momentum associated to a jet from the hard-­scattering interaction. Discrimination between jets produced in the hard-­scatter and those originating in pile-­up using the JVF in events simulated at L=2×1033cm-­‐2s‐1 and 25 ns bunch spacing. Monte Carlo truth information is used to separate jets from pile-­up with pT > 20 GeV in the central region of the detector, and the JVF discriminant is shown for each class of jets.

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 [Jet Vertex Fraction Distribution in Z events]
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The jet vertex fraction (JVF) distribution in data and Monte Carlo simulation for jets in in Z → ll (l = e, μ) events. Events must contain at least one primary vertex consisting of 3 or more tracks and are then required to contain exactly two leptons (which are oppositely signed in the case of muons) with pT > 20 GeV and |η| < 2.5 which form an invariant mass 76 < mll < 106 GeV. Jets are reconstructed using an anti‐kt algorithm with distance parameter R = 0.4 and are required to have pT > 25 GeV and |η| < 2.5. The Monte Carlo overestimates the number of jets at low values of JVF, where the jets have a large contribution from vertices coming from additional proton-­proton interactions (“pile-up”).
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 [Jet Vertex Fraction performance in Z events]

The average number of jets, Njet, before (black) and after (red) a cut

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META FILEATTACHMENT attachment="Offset1.eps" attr="h" comment="" date="1325828173" name="Offset1.eps" path="Offset1.eps" size="18745" stream="Offset1.eps" tmpFilename="/usr/tmp/CGItemp59260" user="sch" version="1"
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Revision 22012-01-06 - ArielSchwartzman

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Please ensure this page is compatible with the ATLAS Twiki Rules. Thank You - Patrick Jussel, Maria Smizanska.
In particular:
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[Jet Offset in data (I)]
 
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Calorimeter jet pT as a function of number of reconstructed primary vertices (NPV), for the central pseudo-rapidity region. Calorimeter jets reconstructed at the EM scale are associated to track jets in bins of pT. Each point shows the most probable value of calorimeter jet pT, for a specific pT (track jet) range and NPV.
 
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[Jet Offset in data (II)]

a pT-independent pile-up correction based on simulation (MC11a) is applied to calorimeter jets, and is found to greatly reduce the pile-up contribution. Note that by construction, the pile-up correction is close to zero at the average number of primary vertices, NPV = 5.4.

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[Jet Offset at high luminosity]

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A data set with an integrated luminosity of 0.4 pb-1 and approximately 30 interactions per bunch crossing. Reconstructed tracks originating from the chosen primary vertex were matched within &DeltaR < 0.6 to anti-kt R = 0.6 topo-cluster jets. The sum of the pT of the matched tracks is insensitive to pile-up and correlated with the true jet pT. In each bin of matched track pT, we see clearly the dependence of the calorimeter jet pT on in-time pile-up, as described by the number of reconstructed primary vertices (NPV). This dependence remains linear up to at least NPV = 30, and it is in quantitative agreement with the results of similar studies performed in 2011 data with significantly less pile-up.
 
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[Jet Vertex Fraction Discriminant]

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The average number of jets, Njet, before (black) and after (red) a cut on the jet vertex fraction, |JVF|>0.75, as a function of the number of primary vertices (containing at least 3 tracks) in data and Monte Carlo simulation for jets in Z → ll (l = e, μ) events. Events are required to contain exactly two leptons (which are oppositely signed in the case of muons) with pT > 20 GeV and |η| < 2.5 which form an invariant mass 76 < mll < 106 GeV. Jets are reconstructed using an anti-­kt algorithm with distance parameter D = 0.4 and are required to have pT > 2 GeV and |η| < 2.5. Before the JVF cut, increases with the number of primary vertices, as expected due to the additional proton-­proton interactions (“pile-up”). This increase is faster in the Monte Carlo, suggesting the number of pile-­up jets is overestimated in the simulation. After the cut, Njet is constant with the number of primary vertices and reasonably well described by the Monte Carlo.
 
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Revision 12012-01-05 - ArielSchwartzman

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META TOPICPARENT name="JetEtMissPublicResults"
AtlasPublicTopicHeader.png

JetEtmissApproved2011PileupOffsetAndJVF

<!--optional-->

Please ensure this page is compatible with the ATLAS Twiki Rules. Thank You - Patrick Jussel, Maria Smizanska.
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[Jet Offset in data]

eps file png file

[Jet Offset at high luminosity]

Description

eps file png file

[Jet Vertex Fraction Discriminant]

Description

eps file png file

[Jet Vertex Fraction Distribution in Z events]

Description

eps file png file

[Jet Vertex Fraction performance in Z events]

Description

eps file png file

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<!--Do NOT remove the remaining lines, but add requested info as appropriate-->
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