Measurement of the top-quark pair-production cross section in the lepton+jets channel with the use of b-tagging

Abstract

We present a new measurement of the production cross section for pp → ttbar, at a center-of-mass energy of 7 TeV using data collected by the CMS detector at the Large Hadron Collider. The analysis uses an integrated luminosity of 36 pb−1 of data, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy and hadronic jets. The ttbar content of the data has been enhanced by requiring the presence of at least one jet consistent with originating from b-quark production. The measured cross section is 150 9 (stat.) 17 (syst.) 6 (lumi.) pb.

Approved Results from TOP-10-003 ( click on result to get .jpeg )

Result Channel
ejets.pdf Fitted ttbar cross section for the electron+jets channel
mujets.pdf Fitted ttbar cross section for the muon+jets channel
combine_emu.pdf Fitted ttbar cross section for the combined electron+jets and muon+jets channel

Approved Plots from TOP-10-003 ( click on plot to get .pdf )

Figure Abbreviated Caption
secvtx_pretty_templates.pdf Secondary vertex mass templates used in profile likelihood fit. PNG
SHYFT_legend.pdf Legend for profile likelihood fit plots. PNG
tagged_both_notitle_svm_1j_1t_mu_svm_2j_1t_mu_svm_3j_1t_mu_svm_4j_1t_mu_svm_5j_1t_mu.pdf Fitted vertex mass in 1-tag events in the muon channel. PNG
tagged_both_notitle_svm_1j_1t_el_svm_2j_1t_el_svm_3j_1t_el_svm_4j_1t_el_svm_5j_1t_el.pdf Fitted vertex mass in 1-tag events in the electron channel. PNG
tagged_both_notitle_svm_2j_2t_mu_svm_3j_2t_mu_svm_4j_2t_mu_svm_5j_2t_mu.pdf Fitted vertex mass in 2-tag events in the muon channel. PNG
tagged_both_notitle_svm_2j_2t_el_svm_3j_2t_el_svm_4j_2t_el_svm_5j_2t_el.pdf Fitted vertex mass in 2-tag events in the electron channel. PNG
prettyplots_mu_hT.pdf Scalar sum of transverse energies in the muon channel. PNG
prettyplots_el_hT.pdf Scalar sum of transverse energies in the electron channel. PNG
prettyplots_mu_wMT.pdf W transverse mass in the muon channel. PNG
prettyplots_el_wMT.pdf W transverse mass in the electron channel. PNG
prettyplots_mu_MET.pdf Missing transverse energy in the muon channel. PNG
prettyplots_el_MET.pdf Missing transverse energy in the electron channel. PNG
top-10-003_table1.pdf Fit results of the muon-only fit. PNG
top-10-003_table2.pdf Uncertainties of the muon-only fit. PNG
top-10-003_table3.pdf Fit results of the electron-only fit. PNG
top-10-003_table4.pdf Uncertainties of the electron-only fit. PNG
top-10-003_table5.pdf Correlation matrix of the combined muon/electron fit. PNG
top-10-003_table6.pdf Uncertainties of the combined muon/electron fit. PNG

Cross Check Analysis -- Muon Channel with muon-in-jet tagging Abbreviated Caption
njet_smt_vetos.pdf Jet multiplicity in muon channel with at least one muon-in-jet. The measured cross section is 163 +/-21 (stat.) +/-35 (syst.) +/-7 (lumi.) pb PNG

Cross Check Analysis -- Neural Net Abbreviated Caption
Data_Fit_rotated.pdf Fit result of neural net cross-check analysis. The measured cross section is 151 +/-15 (stat.) +35-28 (syst.) +/-6 (lumi.) pb PNG

Cross Check Analysis -- Electron Channel Abbreviated Caption
lumi_NBtag3J.pdf B-tag multiplicity in the electron channel. The measured cross section is 169 +/-13 (stat.) +39-32 (syst.) +/-7 (lumi.) pb PNG

-- SalvatoreRoccoRappoccio - 14-Mar-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Data_Fit_rotated.pdf r1 manage 106.6 K 2011-03-14 - 19:36 UnknownUser UMD Neural Net Cross Check Analysis Results
PNGpng Data_Fit_rotated.png r1 manage 103.3 K 2011-03-14 - 19:36 UnknownUser UMD Neural Net Cross Check Analysis Results
PDFpdf SHYFT_legend.pdf r1 manage 155.7 K 2011-03-15 - 14:30 SalvatoreRRappoccio  
PNGpng SHYFT_legend.png r1 manage 14.0 K 2011-03-15 - 14:30 SalvatoreRRappoccio  
JPEGjpg combine_emu.jpg r2 r1 manage 15.7 K 2011-03-15 - 18:06 SadiaKhalil  
PDFpdf combine_emu.pdf r1 manage 11.6 K 2011-03-15 - 17:57 SadiaKhalil  
PNGpng combine_emu.png r1 manage 15.7 K 2011-03-15 - 18:08 SadiaKhalil  
PNGpng ejets.png r1 manage 5.5 K 2011-03-15 - 16:39 SadiaKhalil  
Keykey ele.pdf.key r2 r1 manage 8.0 K 2011-03-15 - 18:00 SadiaKhalil  
PDFpdf lumi_NBtag3J.pdf r1 manage 14.0 K 2011-03-14 - 17:59 UnknownUser  
PNGpng lumi_NBtag3J.png r1 manage 21.4 K 2011-03-14 - 17:59 UnknownUser  
PDFpdf mujets.pdf r1 manage 8.0 K 2011-03-15 - 18:01 SadiaKhalil  
PNGpng mujets.png r1 manage 5.7 K 2011-03-15 - 16:41 SadiaKhalil  
PDFpdf njet_smt_vetos.pdf r1 manage 15.3 K 2011-03-14 - 17:43 WeeDonTeo  
PNGpng njet_smt_vetos.png r1 manage 19.0 K 2011-03-14 - 17:44 WeeDonTeo  
PDFpdf prettyplots_el_MET.pdf r1 manage 15.1 K 2011-03-14 - 14:16 SalvatoreRRappoccio  
PNGpng prettyplots_el_MET.png r1 manage 14.8 K 2011-03-14 - 14:15 SalvatoreRRappoccio  
PDFpdf prettyplots_el_hT.pdf r1 manage 15.4 K 2011-03-14 - 14:16 SalvatoreRRappoccio  
PNGpng prettyplots_el_hT.png r1 manage 15.8 K 2011-03-14 - 14:16 SalvatoreRRappoccio  
PDFpdf prettyplots_el_wMT.pdf r1 manage 17.9 K 2011-03-14 - 14:15 SalvatoreRRappoccio  
PNGpng prettyplots_el_wMT.png r1 manage 16.3 K 2011-03-14 - 14:15 SalvatoreRRappoccio  
PDFpdf prettyplots_mu_MET.pdf r1 manage 15.7 K 2011-03-14 - 14:14 SalvatoreRRappoccio  
PNGpng prettyplots_mu_MET.png r1 manage 16.3 K 2011-03-14 - 14:14 SalvatoreRRappoccio  
PDFpdf prettyplots_mu_hT.pdf r1 manage 15.6 K 2011-03-14 - 14:13 SalvatoreRRappoccio  
PNGpng prettyplots_mu_hT.png r1 manage 16.0 K 2011-03-14 - 14:13 SalvatoreRRappoccio  
PDFpdf prettyplots_mu_wMT.pdf r1 manage 17.8 K 2011-03-14 - 14:13 SalvatoreRRappoccio  
PNGpng prettyplots_mu_wMT.png r1 manage 15.7 K 2011-03-14 - 14:13 SalvatoreRRappoccio  
PDFpdf secvtx_pretty_templates.pdf r1 manage 13.7 K 2011-03-14 - 14:23 SalvatoreRRappoccio  
PNGpng secvtx_pretty_templates.png r1 manage 10.2 K 2011-03-14 - 14:23 SalvatoreRRappoccio  
PDFpdf tagged_both_notitle_svm_1j_1t_el_svm_2j_1t_el_svm_3j_1t_el_svm_4j_1t_el_svm_5j_1t_el.pdf r2 r1 manage 19.7 K 2011-03-14 - 15:36 CharlesPlager  
PNGpng tagged_both_notitle_svm_1j_1t_el_svm_2j_1t_el_svm_3j_1t_el_svm_4j_1t_el_svm_5j_1t_el.png r2 r1 manage 13.8 K 2011-03-14 - 15:36 CharlesPlager  
PDFpdf tagged_both_notitle_svm_1j_1t_mu_svm_2j_1t_mu_svm_3j_1t_mu_svm_4j_1t_mu_svm_5j_1t_mu.pdf r2 r1 manage 20.1 K 2011-03-14 - 15:37 CharlesPlager  
PNGpng tagged_both_notitle_svm_1j_1t_mu_svm_2j_1t_mu_svm_3j_1t_mu_svm_4j_1t_mu_svm_5j_1t_mu.png r2 r1 manage 13.5 K 2011-03-14 - 15:37 CharlesPlager  
PDFpdf tagged_both_notitle_svm_2j_2t_el_svm_3j_2t_el_svm_4j_2t_el_svm_5j_2t_el.pdf r2 r1 manage 18.4 K 2011-03-14 - 15:38 CharlesPlager  
PNGpng tagged_both_notitle_svm_2j_2t_el_svm_3j_2t_el_svm_4j_2t_el_svm_5j_2t_el.png r2 r1 manage 13.2 K 2011-03-14 - 15:38 CharlesPlager  
PDFpdf tagged_both_notitle_svm_2j_2t_mu_svm_3j_2t_mu_svm_4j_2t_mu_svm_5j_2t_mu.pdf r2 r1 manage 18.3 K 2011-03-14 - 15:38 CharlesPlager  
PNGpng tagged_both_notitle_svm_2j_2t_mu_svm_3j_2t_mu_svm_4j_2t_mu_svm_5j_2t_mu.png r2 r1 manage 13.0 K 2011-03-14 - 15:38 CharlesPlager  
PDFpdf top-10-003_table1.pdf r1 manage 65.6 K 2011-03-15 - 14:07 SalvatoreRRappoccio  
PNGpng top-10-003_table1.png r1 manage 79.0 K 2011-03-15 - 14:06 SalvatoreRRappoccio  
PNGtiff top-10-003_table1.tiff r1 manage 123.8 K 2011-03-15 - 14:00 SalvatoreRRappoccio  
PDFpdf top-10-003_table2.pdf r1 manage 49.5 K 2011-03-15 - 14:08 SalvatoreRRappoccio  
PNGpng top-10-003_table2.png r1 manage 65.4 K 2011-03-15 - 14:06 SalvatoreRRappoccio  
PNGtiff top-10-003_table2.tiff r1 manage 90.0 K 2011-03-15 - 14:00 SalvatoreRRappoccio  
PDFpdf top-10-003_table3.pdf r1 manage 59.9 K 2011-03-15 - 14:08 SalvatoreRRappoccio  
PNGpng top-10-003_table3.png r1 manage 74.7 K 2011-03-15 - 14:07 SalvatoreRRappoccio  
PNGtiff top-10-003_table3.tiff r1 manage 114.8 K 2011-03-15 - 14:00 SalvatoreRRappoccio  
PDFpdf top-10-003_table4.pdf r1 manage 49.7 K 2011-03-15 - 14:08 SalvatoreRRappoccio  
PNGpng top-10-003_table4.png r1 manage 65.4 K 2011-03-15 - 14:07 SalvatoreRRappoccio  
PNGtiff top-10-003_table4.tiff r1 manage 89.5 K 2011-03-15 - 14:01 SalvatoreRRappoccio  
PDFpdf top-10-003_table5.pdf r1 manage 59.8 K 2011-03-15 - 14:08 SalvatoreRRappoccio  
PNGpng top-10-003_table5.png r1 manage 76.7 K 2011-03-15 - 14:07 SalvatoreRRappoccio  
PNGtiff top-10-003_table5.tiff r1 manage 130.4 K 2011-03-15 - 14:01 SalvatoreRRappoccio  
PDFpdf top-10-003_table6.pdf r1 manage 51.8 K 2011-03-15 - 14:09 SalvatoreRRappoccio  
PNGpng top-10-003_table6.png r1 manage 68.5 K 2011-03-15 - 14:07 SalvatoreRRappoccio  
PNGtiff top-10-003_table6.tiff r1 manage 94.3 K 2011-03-15 - 14:02 SalvatoreRRappoccio  
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