Difference: JetCalibrationTTBarEvents (5 vs. 6)

Revision 62010-02-03 - AndreaMassironi

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META TOPICPARENT name="AndreaMassironi"

Jets calibration using $t\bar{t}$ events

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  • pT from b
  • pT from q
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Following images may be obtimized!
 
img78c5da62fbacd32652117af2e76dc0fd.png
ΔR bb
imgec74bf0ffdd6c81d943dbed82131e40a.png
ΔR qq
img2ebf118138fe2b77aa4ed38c91d44d2d.png
pT of RECO b jet
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 The best jet combination is defined as the one that maximizes
\[ P = \Pi LR_{i} \]
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Results: After "pool" matched with ΔR<0.3 and pT RECO / pT MC between 0.1 an 2.0.
  • ~ 20% for 4 matched jets
  • ~ 40% for 3+4 matched jets

-> not very performing: distribution bad parametrized + range of distributions to be reviewed.

BDT method:

(6) bkg + sig: one combination for every event (random)

(9) bkg + sig: all combinations for every event

Results: (6) or (9) (similar results)

  • ~ 35-40% for 4 matched jets
  • ~ 70% for 3+4 matched jets

"Simple" method:

(13) Two highest b-tag values are jets from b quark, while between the remaining jets the two highest pT ones are jets from W.

Results:

  • ~ 20% for 4 matched jets
  • ~ 55% for 3+4 matched jets

do http://cmsdoc.cern.ch/~amassiro/TTBar/Code/TestBestIDAlgo.txt to test

 

Background sample

 
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