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Revisiting the Top Background (and a little of B-tagging)
- G. Codispoti, J.F. de Trocóniz
Revisiting the Top Background (and a little of B-tagging) G. - - PowerPoint PPT Presentation
Revisiting the Top Background (and a little of B-tagging) G. - - PowerPoint PPT Presentation
May12 Higgs 2l2q Working Meeting Revisiting the Top Background (and a little of B-tagging) G. Codispoti, J.F. de Trocniz Universidad Autnoma de Madrid Outline q Using e data for top(+X) background: full 2011 results. q First
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Description of the 2011 eµ + jj Sample
M(eµ) > 50 GeV eµ in Z mass window q Sample composition: White: 86% TTbar (X-section +4%) q Blue: 6% fakes (reversing lepton isolation cut); 8% DY (taus) + single top + WW
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Description of the 2011 eµ + jj
eµ in Z mass window eµ and jj in Z mass window q Sample composition: 86% TTbar; 6% fakes; 8% DY (taus) + single top + WW
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Description of the 2011 eµ + jj
≥ 1 TCHEM tag 2 (TCHEM + TCHEL) tags MET Significance < 10. q Sample composition: 89(94)% TTbar; 6(3)% fakes; 5(3)% other small backgr.
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Top(+X) Background in DY + jj Sample
q eµ and ee/µµ top data are symmetric in normalization and shape: predicted by MC and confirmed using high-MET and/or out-of-Z- mass-window data.
2011 ee/µµ data ≥ 1 TCHEM tag 2011 eµ data 2011 eµ data 2011 ee/µµ data ≥ 1 TCHEM tag
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Top(+X) Background in DY + jj Sample
q eµ and ee/µµ top data are symmetric in normalization and shape: predicted by MC and confirmed using high-MET and/or out-of-Z- mass-window data.
2011 ee/µµ data 2 (TCHEM + TCHEL) tags 2011 eµ data 2011 eµ data 2011 ee/µµ data 2 (TCHEM + TCHEL) tags
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Top(+X) Background in DY + jj Sample
q Is DATA; is available; is understood. q We might consider using a top(+X) data-driven background subtraction in the signal and sideband mass regions; the alpha correction would be restricted to the DY background.
2011 eµ data 2011 ee/µµ data ≥ 1 TCHEM tag leptonic Z sidebands 2011 eµ data 2011 ee/µµ data ≥ 1 TCHEM tag leptonic Z sidebands
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eµ + jj Data: 2011 vs. 2012
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eµ + jj Data: 2011 vs. 2012
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eµ + jj Data: 2011 vs. 2012
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eµ + jj Data: 2011 vs. 2012
≥ 1TCHEM tag 2 (TCHEM + TCHEL) tags
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SF for TC HE: Light Jets
< 0 0 - L L - M M < 0 M L-M 0 - L
q Light flavor enriched jet sample (2011 ee and µµ data). q Jets ordered by TCHE discriminator value. TCHE Discr. For 1st Jet TCHE Discr. For 2nd Jet q Standard efficiencies and SFs.
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SF for TC HE: B-jets
< 0 0 - L L - M M < 0 M L-M 0 - L
q B-enriched jet sample (2011 eµ data). q Jets ordered by TCHE discriminator value. TCHE Discr. For 1st Jet TCHE Discr. For 2nd Jet q Standard efficiencies and SFs.
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SF for Jet Probability: Light Jets
< 0 0 - L L - M M < 0 M L-M 0 - L
q Light flavor enriched jet sample (2011 ee and µµ data). q Jets ordered by JP discriminator value. JP Discr. For 1st Jet JP Discr. For 2nd Jet q Standard efficiencies and SFs.
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SF for Jet Probability: B-jets
< 0 0 - L L - M M < 0 M L-M 0 - L
q B-enriched jet sample (2011 eµ data). q Jets ordered by JP discriminator value. JP Discr. For 1st Jet JP Discr. For 2nd Jet q Standard efficiencies and SFs.
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SF for Jet Probability: B-jets
< 0 0 - L L - M M < 0 M L-M 0 - L
q B-enriched jet sample (2011 eµ data). q Jets ordered by JP discriminator value. JP Discr. For 1st Jet JP Discr. For 2nd Jet q For B-jets it’s much better to use SF_b = 1. (?!)
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BACKUP
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