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b-tag exercise

b-tag exercise. sample: the first 4 root files from ttbar MC sample “group10.phys-sm.mc09_7TeV.105200.T1_McAtNlo_Jimmy.recon.ESD.e510_s765_s767_r1302.WZphys.100612.07.D3PD” require b-tag variable “tag_sv0_w” > 5.72. number of jets before b-tagging. number of jets after b-tagging. tag_sv0_w.

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b-tag exercise

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  1. b-tag exercise • sample: the first 4 root files from ttbar MC sample “group10.phys-sm.mc09_7TeV.105200.T1_McAtNlo_Jimmy.recon.ESD.e510_s765_s767_r1302.WZphys.100612.07.D3PD” • require b-tag variable “tag_sv0_w” > 5.72 number of jets before b-tagging number of jets after b-tagging tag_sv0_w tag_sv0_w

  2. b-tag exercise • number of events vs. number of b-tagged jets in each passing event

  3. qq-bar  W’  bt  bbW  bblv • W’ very heavy • W’ has momentum tends to zero at lab frame • b and t travels in the opposite direction • the two b’s likely to travel at a roughly opposite direction

  4. also… • revising the write-up of my QCD background study • learning how to generate W’ sample by PYTHIA • several steps (and days) are required to generate the sample • what to do in the coming few days: • tonight: finish revising the write-up • tomorrow and later: generate the samples and write my code

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