Introduction

We are going to look single top tW production channel, with the final states of 3 jets, of which one is from b-quark, one lepton, and missing transverse energy from netrino. The aim is to provide complementary observation of tW to dilepton channel, and perform Vtb measurements. This analysis is already defined in single top group ongoing analysis(Aug. 2013).

(wo)Man power

IHEP Beijing group: Guoming Chen, Xiangwei Meng, Huaqiao Zhang, Shihai Zhu(Post-Doc)

Meetings and presentations

24 Oct. 2013 Single top Round table: by Huaqiao

22 Aug 2013 Single top meeting: by Huaqiao

Data and MC samples (2012 full 8 TeV 19.8 fb-1 data)

SingleTopMC

useful path at IHEP:

downloaded files: /publicfs/cms/data/TopQuark

Code examples and tutorial:

Event Selection

Analysis Framework, Reference Selection, Systematics,

Background estimation

We estimate top-pair, single top t-, s-channel from MC, and estimate QCD fake lepton, W+jets contribution from data driven methods

QCD fake lepton estimation

W+jets estimation

Seperation of tW from backgrounds

We use Multi-Variable Analysis (MVA) method to combine several discriminate variables into a powerful one to separate tW from background. The chosen one is Boost Decision Tree (BDT).

BDT inpt variable defination

Statistics tool to retrieve tW from backgrounds

Tool kit of Theta: http://www-ekp.physik.uni-karlsruhe.de/~ott/theta/theta-auto/

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Topic revision: r3 - 2013-10-25 - Huaqiao2Zhang
 
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