Difference: HadronicTopReconstruction (1 vs. 4)

Revision 402 Oct 2012 - Main.RicardoVillalba

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META FILEATTACHMENT attachment="mtop.png" attr="" comment="" date="1348708409" name="mtop.png" path="mtop.png" size="18564" stream="mtop.png" tmpFilename="/usr/tmp/CGItemp16199" user="magania" version="3"
META FILEATTACHMENT attachment="tag.png" attr="" comment="" date="1348708406" name="tag.png" path="tag.png" size="19531" stream="tag.png" tmpFilename="/usr/tmp/CGItemp16229" user="magania" version="3"
META FILEATTACHMENT attachment="dRmin.png" attr="" comment="" date="1348708415" name="dRmin.png" path="dRmin.png" size="17401" stream="dRmin.png" tmpFilename="/usr/tmp/CGItemp16157" user="magania" version="2"
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META FILEATTACHMENT attachment="slides.pdf" attr="" comment="" date="1349194186" name="slides.pdf" path="slides.pdf" size="210032" stream="slides.pdf" tmpFilename="/usr/tmp/CGItemp15801" user="magania" version="1"
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Revision 302 Oct 2012 - Main.RicardoVillalba

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META TOPICPARENT name="RicardoVillalba"
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META FILEATTACHMENT attachment="mtop.png" attr="" comment="" date="1348708409" name="mtop.png" path="mtop.png" size="18564" stream="mtop.png" tmpFilename="/usr/tmp/CGItemp16199" user="magania" version="3"
META FILEATTACHMENT attachment="tag.png" attr="" comment="" date="1348708406" name="tag.png" path="tag.png" size="19531" stream="tag.png" tmpFilename="/usr/tmp/CGItemp16229" user="magania" version="3"
META FILEATTACHMENT attachment="dRmin.png" attr="" comment="" date="1348708415" name="dRmin.png" path="dRmin.png" size="17401" stream="dRmin.png" tmpFilename="/usr/tmp/CGItemp16157" user="magania" version="2"
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META FILEATTACHMENT attachment="slides.pdf" attr="" comment="" date="1349194186" name="slides.pdf" path="slides.pdf" size="210032" stream="slides.pdf" tmpFilename="/usr/tmp/CGItemp15801" user="magania" version="1"

Revision 228 Sep 2012 - Main.RicardoVillalba

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META TOPICPARENT name="RicardoVillalba"
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M_jj M_jjj tag ttsl efficiency ttdl efficiency significance S/sqrt(S+B)
50 - 120 130 - 200 > 0.12 0.954 0.867 1.59
60 - 110 140 - 190 > 0.14 0.908 0.755 1.59
70 - 110 150 - 190 > 0.16 0.830 0.627 1.55

Significance is estimated from the numbers in here: https://indico.cern.ch/getFile.py/access?contribId=4&resId=0&materialId=slides&confId=174826, considering ttsl_efficiency the same in signal, reducing ttdl bkg by ttdl_efficiency and everything else fixed.

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For the hadronic top reconstruction I have included the MBL variable (the mass of the lepton plus the other b jet), and added a cut on the b tag as follows: I remove candidates where the W jets are more "b tagged" than the other b jets, this worked a little better than requiring the b jets to be b tagged.
Then I apply the following cuts on this variables:

Pt - Minimum Pt of the jets
M_jj - Invariant mass of the W jets
M_jjj - Invariant mass of the Top candidate
drW - DeltaR between Wjets
dRt - DeltaR between the reconstructed top and l+jet

Pt M_jj M_jjj dRW dRt mlb eff tt->l jets (%) eff tt->ll (%)

10 50 - 120 140 - 200 2.5 1.5 150 75 52
20 50 - 120 140 - 200 2.5 1.5 150 68 42
30 50 - 120 140 - 200 2.5 1.5 150 54 27


The "efficiency" is the number of events that satisfy all cuts divided by the events that satisfy the preliminary cuts ( 4 jets, 1 b tag , isolation and so on). I am still optimizing the cuts, but not much will be gained. I think this is the best we can do without including more variables (suggestions?) or making a more sophisticated discriminator.

  -- RicardoVillalba - 26 Sep 2012

Revision 126 Sep 2012 - Main.RicardoVillalba

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META TOPICPARENT name="RicardoVillalba"
MC samples:

/tas/vimartin/SingleLepton2011/output/V00-04-13/ttsl_smallTree.root

/tas/vimartin/SingleLepton2011/output/V00-04-13/ttdl_smallTree.root

Hadronic top reconstruction with NO CUTS ( just to plot )

For the sigma(pt) neded in the W mass constraint fit the function getJetMetSys (in NtupleMacros /CORE/jetSelections.cc) has been copied TO THE SELECTION CODE and MODIFIED (return result*0.01 instead of 1+flag*result*0.01). Added also MC matching.

Distribution of three jet combinations:

mW.pngmtop.png

dRW.pngDeltaR minimum between W jets and b candidate jet

tag.pngbtagWB.png

The following cuts have been selected:

M_jj M_jjj tag ttsl efficiency ttdl efficiency significance S/sqrt(S+B)
50 - 120 130 - 200 > 0.12 0.954 0.867 1.59
60 - 110 140 - 190 > 0.14 0.908 0.755 1.59
70 - 110 150 - 190 > 0.16 0.830 0.627 1.55

Significance is estimated from the numbers in here: https://indico.cern.ch/getFile.py/access?contribId=4&resId=0&materialId=slides&confId=174826, considering ttsl_efficiency the same in signal, reducing ttdl bkg by ttdl_efficiency and everything else fixed.

-- RicardoVillalba - 26 Sep 2012

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META FILEATTACHMENT attachment="tag.png" attr="" comment="" date="1348708406" name="tag.png" path="tag.png" size="19531" stream="tag.png" tmpFilename="/usr/tmp/CGItemp16229" user="magania" version="3"
META FILEATTACHMENT attachment="dRmin.png" attr="" comment="" date="1348708415" name="dRmin.png" path="dRmin.png" size="17401" stream="dRmin.png" tmpFilename="/usr/tmp/CGItemp16157" user="magania" version="2"
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