Getting sample and code

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Presentation transcript:

Getting sample and code Download the package http://pan.baidu.com/s/1pK81ZAV tar xvf tagprobe_istep.tar .L dataanalyze.C run()

Data Sample Generated from MC for LHC production with ATLAS detector simulation ****************************************************************************** *Tree :data : data * *Entries : 105265 : Total = 5614290 bytes File Size = 2732107 * * : : Tree compression factor = 2.05 * *Br 0 :ele_N : ele_N/I * *Entries : 105265 : Total Size= 422918 bytes File Size = 44030 * *Baskets : 17 : Basket Size= 32000 bytes Compression= 9.59 * *............................................................................* *Br 1 :ele_PT : ele_PT[ele_N]/F * *Entries : 105265 : Total Size= 1038188 bytes File Size = 723075 * *Baskets : 47 : Basket Size= 32000 bytes Compression= 1.43 * *Br 2 :ele_Eta : ele_Eta[ele_N]/F * *Entries : 105265 : Total Size= 1038239 bytes File Size = 749259 * *Baskets : 47 : Basket Size= 32000 bytes Compression= 1.38 * *Br 3 :ele_Phi : ele_Phi[ele_N]/F * *Entries : 105265 : Total Size= 1038239 bytes File Size = 750433 * *Br 4 :ele_Charge : ele_Charge[ele_N]/I * *Entries : 105265 : Total Size= 1038385 bytes File Size = 246315 * *Baskets : 47 : Basket Size= 32000 bytes Compression= 4.21 * *Br 5 :ele_tight : ele_tight[ele_N]/I * *Entries : 105265 : Total Size= 1038334 bytes File Size = 216414 * *Baskets : 47 : Basket Size= 32000 bytes Compression= 4.79 * Electron information only: Momentum Electric charge Electron ID_tight (=1, passing tight selection)

Data Composition Mixture of Zee process and QCD dijet process With some small probability, jet is mis-reconstructed as electron

Efficiency Measurement If directly counting the number of electrons passing the tight selection, we get Electron sample is not pure, contaminated by jet-faked electron Too low to be correct!

Tag&Probe Applying tag&probe Some improvement, but still not pure enough

Tag&probe with background subtraction Fit the spectrum to remove the background contribution

Question and Task Any way to reduce the background contribution at selection level? Narrower window around Z peak? Charge information? Is efficiency a constant? Dependence on the pseudorapidity? Dependence on the pT? Uncertainty? Statistical uncertainty? Systematic uncertainty?