Difference: SingleTopHiggsBB (13 vs. 14)

Revision 142013-08-08 - AndreaGiammanco

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META TOPICPARENT name="AndreaGiammanco"

CMS Single Top + Higgs analysis with bb decay

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Software framework(s)

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We have two: the one developed by Andrey (Louvain/Moscow's framework) and used also in Nebraska, and the Karlsruhe one. We will have to make a "synchronization exercise" as soon as possible, for mutual cross check.
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We have two: the one developed by Andrey (Louvain/Moscow's framework) and used also in Nebraska, and the Karlsruhe one. The UZH group is adapting the skimming code from the main single top t- and s-channel analysis.
 

Synchronization

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As discussed, we will conduct a synchronization of the two frameworks, which can contain an entry from each user. The current suggestion is to use Andrey's N Jet / M Tag bins that include 4/3, 5/3, 6/3, 5/4, and 6/4. In the table below, these bins should be merged into one value. At the moment, I have a cut flow of the pre-selection.

Muon channel

Signal SM- Dan KIT Andrey
AODSIM Events      
nTuple Selection (0)      
After Lepton Cuts (1-3)      
After Jets Cuts (4)      
NJetMTag Req.      

Bkg ttbar-semi Dan ...

Electron channel

Signal SM- Dan KIT Andrey
AODSIM Events      
nTuple Selection (0)      
After Lepton Cuts (1-3)      
After Jets Cuts (4)      
NJetMTag Req.      

Bkg ttbar-semi Dan ...
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Objects definitions and event selection

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ACTION: please somebody write here a table with all the selection steps (with very high granularity, on the model of the "top reference selections").
 ACTION: we are using single-lepton triggers for simplicity, but we would gain statistics (without worsening S/B) by using cross-triggers like l+3j or l+b, and correspondingly loosening the offline lepton thresholds. But this would bring the complication of dealing with the turn-on curves of the hadronic part of the trigger, and additional systematics. Nevertheless, it is likely that in the end we would gain. Volunteers needed to study the optimal trigger option!

Analysis setup, definitions of physics objects, and reference event selection are described in SingleTopHiggsBBEventSel

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  Consensus is on using "Combine" (the official Higgs PAG tool) for the final result, but Theta for quick evaluations (for example when comparing several options for fitting) because it is faster.
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ACTION: volunteers for a first look (with what we have already in our hands) are needed urgently.
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The current Theta setup is described in these slides.
 

Blinding policy

 
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