Difference: CentralityVariables (1 vs. 5)

Revision 5
16 Oct 2009 - Main.TomRockwell
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META TOPICPARENT name="Trash.Tier3WebHome"
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META TOPICPARENT name="Trash.Trash/Tier3WebHome"
 

Centrality

Centrality refers to the sum of the Pt of the particles considered, over the sum of the P of the same particles. This thus contains information about the relative locations of these particles, as well as the location relative to the transverse direction. This combination is particularly potent at separating out different event types. Plots of various centrality variables for 1 and 2 b-tagged jet selection can be seen below. For an example, we will show the 1 b-tagged jet selection, isolated for 3 jets.
Revision 4
13 Oct 2009 - Main.ChipBrock
Line: 1 to 1
Changed:
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META TOPICPARENT name="WebHome"
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META TOPICPARENT name="Trash.Tier3WebHome"
 

Centrality

Centrality refers to the sum of the Pt of the particles considered, over the sum of the P of the same particles. This thus contains information about the relative locations of these particles, as well as the location relative to the transverse direction. This combination is particularly potent at separating out different event types. Plots of various centrality variables for 1 and 2 b-tagged jet selection can be seen below. For an example, we will show the 1 b-tagged jet selection, isolated for 3 jets.
Revision 3
02 Jun 2009 - Main.JennyHolzbauer
Line: 1 to 1
 
META TOPICPARENT name="WebHome"

Centrality

Centrality refers to the sum of the Pt of the particles considered, over the sum of the P of the same particles. This thus contains information about the relative locations of these particles, as well as the location relative to the transverse direction. This combination is particularly potent at separating out different event types. Plots of various centrality variables for 1 and 2 b-tagged jet selection can be seen below. For an example, we will show the 1 b-tagged jet selection, isolated for 3 jets.
Revision 2
12 May 2009 - Main.JennyHolzbauer
Line: 1 to 1
 
META TOPICPARENT name="WebHome"

Centrality

Changed:
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Centrality refers to the sum of the Pt of the particles considered, over the sum of the P of the same particles. This thus contains information about the relative locations of these particles, as well as the location relative to the transverse direction. This combination is particularly potent at separating out different event types.
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>
Centrality refers to the sum of the Pt of the particles considered, over the sum of the P of the same particles. This thus contains information about the relative locations of these particles, as well as the location relative to the transverse direction. This combination is particularly potent at separating out different event types. Plots of various centrality variables for 1 and 2 b-tagged jet selection can be seen below. For an example, we will show the 1 b-tagged jet selection, isolated for 3 jets.

!AllJetLeptonCentrality, 1 b-tag Sample !Jet12Centrality, 1 b-tag Sample !LastJetLeptonCentrality, 1 b-tag Sample
<-- -->
Sorted ascending
AllJetLeptonCentrality, 2 b-tag Sample Jet12Centrality, 2 b-tag Sample LastJetLeptonCentrality, 2 b-tag Sample
_AllJetsLepton_Centrality_tag1_new.gif" _Jet12Lepton_Centrality_tag1_new.gif" _LastJetLepton_Centrality_tag1_new.gif"
_AllJetsLepton_Centrality_tag2_new.gif" _Jet12Lepton_Centrality_tag2_new.gif" _LastJetLepton_Centrality_tag2_new.gif"
 

If we examine the centrality of the last jet and the lepton, for instance, after single-top preselection cuts, we find that there is a peak of W+jets background around 0.2 for the 1 b-tagged jet selection. If some cuts are taken on lepton eta, pt and last jet p, we find that this background bump flattens out if events with a large P for the lepton and the light quark jet, which are both close to the beam are removed. The W+jets drops off after this 0.2 or so region since the particles stay near the beam and the overall Pt won't get much higher, since the Pt of the misreconstructed light quark is pretty high already. That the Pt is as high as it is, is a result of the single-top preselection cuts.
Line: 33 to 38
 
META FILEATTACHMENT attachment="_LastJetLepton_Centrality_tag1_new_3jet_lepetaless1.gif" attr="" comment="lastjetlep_1tag_3jet_lepetaless1" date="1242058645" name="_LastJetLepton_Centrality_tag1_new_3jet_lepetaless1.gif" path="_LastJetLepton_Centrality_tag1_new_3jet_lepetaless1.gif" size="7363" stream="_LastJetLepton_Centrality_tag1_new_3jet_lepetaless1.gif" tmpFilename="/usr/tmp/CGItemp21655" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_Jet12_Centrality_tag1_new_3jet_lepetaless1.gif" attr="" comment="jet12cent_tag1_3jet_lepetaless1" date="1242058677" name="_Jet12_Centrality_tag1_new_3jet_lepetaless1.gif" path="_Jet12_Centrality_tag1_new_3jet_lepetaless1.gif" size="7754" stream="_Jet12_Centrality_tag1_new_3jet_lepetaless1.gif" tmpFilename="/usr/tmp/CGItemp21701" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_AllJetsLepton_Centrality_tag1_new_3jet_lepetaless1.gif" attr="" comment="alljetlepcent_tag1_3jet_letetaless1" date="1242058723" name="_AllJetsLepton_Centrality_tag1_new_3jet_lepetaless1.gif" path="_AllJetsLepton_Centrality_tag1_new_3jet_lepetaless1.gif" size="7786" stream="_AllJetsLepton_Centrality_tag1_new_3jet_lepetaless1.gif" tmpFilename="/usr/tmp/CGItemp21581" user="JennyHolzbauer" version="1"
Added:
>
>
META FILEATTACHMENT attachment="_AllJetsLepton_Centrality_tag1_new.gif" attr="" comment="alljetlepcent_tag1" date="1242158405" name="_AllJetsLepton_Centrality_tag1_new.gif" path="_AllJetsLepton_Centrality_tag1_new.gif" size="6937" stream="_AllJetsLepton_Centrality_tag1_new.gif" tmpFilename="/usr/tmp/CGItemp21853" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_LastJetLepton_Centrality_tag1_new.gif" attr="" comment="lastjetlep_1tag" date="1242158444" name="_LastJetLepton_Centrality_tag1_new.gif" path="_LastJetLepton_Centrality_tag1_new.gif" size="7068" stream="_LastJetLepton_Centrality_tag1_new.gif" tmpFilename="/usr/tmp/CGItemp21851" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_Jet12_Centrality_tag1_new.gif" attr="" comment="jet12cent_tag1" date="1242158465" name="_Jet12_Centrality_tag1_new.gif" path="_Jet12_Centrality_tag1_new.gif" size="6724" stream="_Jet12_Centrality_tag1_new.gif" tmpFilename="/usr/tmp/CGItemp21882" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_AllJetsLepton_Centrality_tag2_new.gif" attr="" comment="alljetlepcent_tag2" date="1242158486" name="_AllJetsLepton_Centrality_tag2_new.gif" path="_AllJetsLepton_Centrality_tag2_new.gif" size="6826" stream="_AllJetsLepton_Centrality_tag2_new.gif" tmpFilename="/usr/tmp/CGItemp21866" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_LastJetLepton_Centrality_tag2_new.gif" attr="" comment="lastjetlep_tag2" date="1242158507" name="_LastJetLepton_Centrality_tag2_new.gif" path="_LastJetLepton_Centrality_tag2_new.gif" size="6906" stream="_LastJetLepton_Centrality_tag2_new.gif" tmpFilename="/usr/tmp/CGItemp21870" user="JennyHolzbauer" version="1"
META FILEATTACHMENT attachment="_Jet12_Centrality_tag2_new.gif" attr="" comment="jet12cent_tag2" date="1242158526" name="_Jet12_Centrality_tag2_new.gif" path="_Jet12_Centrality_tag2_new.gif" size="6659" stream="_Jet12_Centrality_tag2_new.gif" tmpFilename="/usr/tmp/CGItemp21773" user="JennyHolzbauer" version="1"
 
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