Difference: ARCReviewSUS15009 (12 vs. 13)

Revision 132016-06-24 - BrianFrancis

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META TOPICPARENT name="BrianFrancis"

SUS-15-009: Search for natural GMSB in events with top quark pairs and photons (8 TeV)

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It is for N(b) ≥ 1. In Table 14 of the AN, a fuller table is shown including systematics (see attached Table14_AN.png). Considering systematic uncertainties, the differences perhaps appear not so significant. The PAS should be updated to include systematics; below is the updated table:
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It is for N(b) ≥ 1. In Table 14 of the AN, a fuller table is shown including systematics (see attached Table14_AN.png). Considering systematic uncertainties, the differences appear not so significant. The PAS should be updated to include systematics; below is the updated table:
 
Channel SF(Z, Zgamma)
e 1.38 ± 0.02 ± 0.15
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 SF = 1 - (1-SF(lepton1)) * (1-SF(lepton2))

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As a purely technical issue it seems that the ROOT file containing the scale factors used had the electron trigger scale factors separated, but the muon trigger scale factors had to be divided out in order to apply this approximation. This should introduce some additional uncertainties; when you look at the systematic uncertainty for varying the lepton trigger scale factor on the fit value, you find that the muon channel’s uncertainty on the trigger SF is about 8% higher than that of the electron channel.
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As a purely technical issue it seems that the ROOT file containing the scale factors used had the electron trigger scale factors separated (i.e. trigger and iso*ID), but not so for the muon scale factors (i.e. only trigger*iso*ID); so the muon trigger scale factors had to be divided out in order to apply this approximation. This result of this extra division is that the muon case has an additional approximation with inflated uncertainties; when you look at the systematic uncertainty for varying the lepton trigger scale factor on the fit value, you find that the muon channel’s uncertainty on the trigger SF is about 8% higher than that of the electron channel. The effect of this is quite negligable considering that in SR2 there is a predicted 0.22 muon channel events in the Z+Jets and Zgamma backgrounds that have this scale factor applied.
  In summary I believe the difference is due to the way lepton trigger SFs are applied to each sample for the di-leptonic selection, and in the muon case this adds an additional uncertainty of the order of the disagreement — one that is included in the systematic uncertainties on the fit values in question. I feel the PAS should be updated to include systematics in Table 1.
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  wgamma_sr1.png
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Comments to the PAS:

Legends on the Figures are not readable

Is Fig.2 really something you want in the PAS? Isn't this more something for the twiki? What about adding a plot of the relative composition of ttjets/ttgamma instead?

[For page 20 of the approval talk, concerning the MET plots]: Consider only showing the combination in the PAS.

Legends have been made larger for v3 of the PAS. For Figure 2, a figure something like slide 35 of the approval talk (link) might be relevant, however given how late in the review process the PAS is in, we would prefer to not change it unless absolutely necessary.

Showing the combination plots in the PAS would be amenable, and can be changed if all agree.

 

ARC review

Manfred Paulini on PAS v1:

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