(r10) VBFqcdBG < Main

Main Web>TWikiUsers>NateOdell>VBFqcdBG (revision 10) (raw view)~~EditAttachPDF~~
---+ VBF background analysis

%TOC%

---++ Some useful links

   * [[https://twiki.cern.ch/twiki/bin/viewauth/CMS/VbfHiggs][HiggsVBF main twiki]]

   * [[http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/UserCode/NatesAnalyzer/VBFanalyzer/][The Code]]


---++Tag by p<sub>T</sub>

   Tag jets are, in this case, are the two jets in the event passing all selection cuts that have the largest p<sub>T</sub>.

---+++ Datasets

| *Dataset name* | *Initial N<sub>evt</sub> (10<sup>6</sup>)* | *Final N<sub>evt</sub> (10<sup>3</sup>)* | *Integrated luminosity (nb<sup>-1</sup>)* | *Cross-section (nb)* |
| <b>Data</b> |  |  |  |  |
| /JetMET/Run2010A-Sep17ReReco_v2/RECO | 2.41 | 1.293 | 3100 | --- |
| <b>MC</b> |  |  |  |  |
| /QCD_Pt_15to30_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.097 | --- | 1.41 | 780000 |
| /QCD_Pt_30to50_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.10 | --- | 21.87 | 50300 |
| /QCD_Pt_50to80_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.09 | --- | 180.8 | 6030 |
| /QCD_Pt_15to30_Tune1_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 5.45 | --- | 6.68 | 815900 |
| /QCD_Pt_30to50_Tune1_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.26 | --- | 61.37 | 53120 |
| /QCD_Pt_50to80_Tune1_7TeV_pythia6/Fall10-START38_V12-v1/GEN-SIM-RECO | 3.19 | --- | 501.8 | 6360 |

---+++ Accepted events

   In this case the HLT_Jet30U is selected with an integrated luminosity for the sample is 3.1/pb.  

|**| *Selection Cut*                          | *No. of accepted events* |
|| Initial number of events after preselection:  | 3105866 |
|| Pass HLT selection                                         | 134464 |
|| One and only one primary vertex:                           | 56963 |
|| Vertex displacement in z < 15 cm:                          | 56954 |
|| Vertex ndof >= 4:                                          | 56928 |
|| At least two jets with p<sub>T</sub> > 25 GeV:       |  |
|| Leading p<sub>T</sub> jets with abs(&Delta;&eta;) < 4.0:      |  |


   In addition to these selection cuts, it is requred that jets in the region -2.4 < &eta; < 2.4 pass the following cuts:

   * At least 2 constituents

   * Charged hadronic fraction > 0

   * Charged EM fraction < 1

   * Total neutral fraction < 0.9

  Otherwise, we only require they pass the p<sub>T</sub> requirement.



---+++ Basic distributions for 'tagged' jets


   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Pt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Phi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Eta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Pt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Phi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Eta.png]]

---+++ Dijet quantities

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/deltaEta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/deltaPhi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/dijetMass.png]]


---+++ Inner jet quantities

   To avoid confusion with central jets, I call jets inside the eta region bound by the two tagged jets inner jets.  The following plots are inclusive.

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerMult.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerPt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerPhi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerEta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerZep.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerNormZep.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerZepPrime.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerEFlow.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/MultVsDeltaEta.png]]

---+++ ptHat

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/ptHat.png]]


---++Tag by &eta;

   For this selection we choose the two tagged jets to be the two jets with the largest value of &Delta;&eta;.

---+++ Datasets

| *Dataset name* | *Initial N<sub>evt</sub> (10<sup>6</sup>)* | *Final N<sub>evt</sub> (10<sup>3</sup>)* | *Integrated luminosity (nb<sup>-1</sup>)* | *Cross-section (nb)* |
| /JetMET/Run2010A-Sep17ReReco_v2/RECO | 2.41 | 1.293 | 3100 | --- |
| /QCD_Pt_15to30_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.097 |  | 1.41 | 780000 |
| /QCD_Pt_30to50_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.10 |  | 21.87 | 50300 |
| /QCD_Pt_50to80_Tune1_7TeV_pythia8/Fall10-START38_V12-v1/GEN-SIM-RECO | 1.09 |  | 180.8 | 6030 |


---+++ Accepted events

   In this case the HLT_Jet30U is selected with an integrated luminosity for the sample is 3.1/pb.  

|**| *Selection Cut*                          | *No. of accepted events* |
|| Initial number of events after preselection:  |  |
|| Pass HLT selection                                         |  |
|| One and only one primary vertex:                           |  |
|| Vertex displacement in z < 15 cm:                          |  |
|| Vertex ndof >= 4:                                          |  |
|| At least one jet with abs(eta) > 2.0 & p<sub>T</sub> > 25 GeV:       |  |
|| Two tagged jets with p<sub>T</sub> > 25 GeV and abs(&Delta;&eta;) < 4.0:      |  |


   In addition to these selection cuts, it is requred that jets in the region -2.4 < &eta; < 2.4 pass the following cuts:

   * At least 2 constituents

   * Charged hadronic fraction > 0

   * Charged EM fraction < 1

   * Total neutral fraction < 0.9

  Otherwise, we only require they pass the p<sub>T</sub> requirement.



---+++ Basic distributions for 'tagged' jets


   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet1Pt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet1Phi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet1Eta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet2Pt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet2Phi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/Jet2Eta.png]]

---+++ Dijet quantities

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/deltaEta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/deltaPhi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/dijetMass.png]]


---+++ Inner jet quantities

   To avoid confusion with central jets, I call jets inside the eta region bound by the two tagged jets inner jets.  The following plots are inclusive.

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerMult.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerPt.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerPhi.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerEta.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerZep.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerNormZep.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerZepPrime.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/InnerEFlow.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/MultVsDeltaEta.png]]

---+++ ptHat

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByEta/ptHat.png]]

---++ Original selection

   There is no trigger selection on this sample.  The integrated luminosity is 3.1/pb.

   |**| *Selection Cut*                          | *No. of accepted events* |
   || Initial number of events:                            | 3105866 |
   || One and only one primary vertex:                     | 588685 |
   || Vertex displacement in z < 15 cm:                    | 579057 |
   || Vertex ndof >= 4:                                    | 578850 |
   || At least one forward jet with p_T > 30 GeV:          | 125700 |
   || An additional central jet with p_T > 30 GeV           | 78292 |
   || Two back-to-back forward jets with p_T > 30 GeV:     | 12127 |

      %TWISTY{mode="div" showlink="Forced forward jet selection. &nbsp;" hidelink="Hide it &nbsp;"  firststart="hide" showimgright="%ICONURLPATH{toggleopen-small}%" hideimgright="%ICONURLPATH{toggleclose-small}%"}%

---+++ One forward jet case

   First, I consider the case that you have only one forward jet.  The requirements on this jet are:

   * |&eta;| > 2.6
   * p<sub>T</sub> > 30 GeV

   Because this jet is in HF, I am not currently applying any jet ID cuts, but will once we determine appropriate values.  If one forward jet is found, I then look for the highest p<sub>T</sub> central jet.  The requirements on this jet are:

   * p<sub>T</sub> > 30 GeV
   * N<sub>constituents</sub> > 1
   * Charged hadronic fraction > 0
   * Neutral hadronic fraction < 1
   * Neutral EM fraction < 1

---++++ Basic distributions for 'tagged' jets

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/cntrMult_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Pt_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Phi_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet1Eta_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Pt_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Phi_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/Jet2Eta_1fwd.png]]

---++++ Dijet quantities

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/deltaEta_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/deltaPhi_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/dijetMass_1fwd.png]]

---++++ Inner jet quantities

   To avoid confusion with central jets, I call jets inside the eta region bound by the two tagged jets inner jets.  The following plots are inclusive.

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerMultPt_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerPt_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerPhi_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerEta_1fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/0212/tagByPt/InnerZep_1fwd.png]]
 

---+++ Two forward jets

   The same cuts are applied in this case except there are two jets in the forward region of the detector.  The two forward jets are required to be approximately back-to-back in &eta;.  Only the two leading p<sub>T</sub> forward jets are considered at the moment.

---++++ Basic distributions for 'tagged' jets

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet1Pt_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet1Phi_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet1Eta_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet2Pt_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet2Phi_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/jet2Eta_2fwd.png]]

---++++ Dijet quantities

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/deltaEta_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/deltaPhi_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/dijetMass_2fwd.png]]


---++++ Inner jet quantities

   To avoid confusion with central jets, I call jets inside the eta region bound by the two tagged jets inner jets.

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/centralJetMult_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/innerPt_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/innerPhi_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/innerEta_2fwd.png]]

   [[http://cmsdoc.cern.ch/~naodell/VBF/231110/twoForwardJets/innerZep_2fwd.png]]

%ENDTWISTY%

-- Main.NateOdell - 23-Nov-2010
Topic revision: r10 - 2010-12-02 - NateOdell
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