Inclusive W and Z production cross sections

Physics Analysis Summary in CERN Document Server: CMS-PAS-EWK-10-005

Abstract

We present the measurements of inclusive W and Z production cross sections in electron and muon decay channels at center-of-mass energy of 7 TeV, obtained using 36 inverse-picobarns of pp collisions in the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC). The measured values agree with NNLO QCD cross section calculations and current parton distribution functions.

Approved plots

(click on plots to get PDF versions)

Signal extraction

Transverse missing energy in the electron channel.

w_inc_36pb.png w_inc_36pb_log.png

Transverse missing energy in the muon channel.

Wmn_MET.png Wmn_MET_log.png

Di-electron invariance mass spectrum.

Zee_mass_Linear_corrected.png Zee_mass_Log_corrected.png

Di-muon invariance mass spectrum.

Zmumu_lin.png Zmumu_log.png

Summary of results

The error on integrated luminosity is 4% (represented by a green error bar). See CMS-EWK-10-004. The error bars represent the statistical uncertainty (in black) and the total uncertainty, sum in quadrature of statistical and systematic uncertainties (in blue).

The yellow bands represent predictions obtained with the FEWZ program at the NNLO in QCD with the MSTW2008 set of Parton Density Functions.

W and Z cross sections, in the electron and muon channels, and combined.

Results_W.png Results_Z.png

luminosity-independent ratios

Results_R_WpWm.png Results_R_WZ.png

ratio of CMS results to predictions

Results_ratioTheory.pdf

Ratio of CMS measurement to theory expectations. The experimental uncertainty is the sum in quadrature of the statistical and the systematic uncertainties not including the uncertainty on the extrapolation to the full acceptance due to parton density functions.


GautierHamelDeMonchenault - 17-Mar-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Results_R_WZ.pdf r1 manage 14.8 K 2011-03-18 - 06:54 GautierHamelDeMonchenault  
PNGpng Results_R_WZ.png r1 manage 23.3 K 2011-03-17 - 22:25 GautierHamelDeMonchenault  
PDFpdf Results_R_WpWm.pdf r1 manage 14.0 K 2011-03-18 - 06:54 GautierHamelDeMonchenault  
PNGpng Results_R_WpWm.png r1 manage 22.1 K 2011-03-17 - 17:17 GautierHamelDeMonchenault  
PDFpdf Results_W.pdf r1 manage 14.3 K 2011-03-18 - 06:55 GautierHamelDeMonchenault  
PNGpng Results_W.png r1 manage 23.9 K 2011-03-17 - 21:52 GautierHamelDeMonchenault  
PDFpdf Results_Z.pdf r1 manage 14.3 K 2011-03-18 - 06:56 GautierHamelDeMonchenault  
PNGpng Results_Z.png r1 manage 24.2 K 2011-03-17 - 21:52 GautierHamelDeMonchenault  
PDFpdf Results_ratioTheory.pdf r1 manage 15.2 K 2011-03-18 - 06:53 GautierHamelDeMonchenault  
PNGpng Results_ratioTheory.png r1 manage 28.2 K 2011-03-17 - 21:51 GautierHamelDeMonchenault  
PDFpdf Wmn_MET.pdf r1 manage 20.2 K 2011-03-18 - 07:06 GautierHamelDeMonchenault  
PNGpng Wmn_MET.png r1 manage 36.3 K 2011-03-17 - 21:46 GautierHamelDeMonchenault  
PDFpdf Wmn_MET_log.pdf r1 manage 36.6 K 2011-03-18 - 07:07 GautierHamelDeMonchenault  
PNGpng Wmn_MET_log.png r1 manage 48.1 K 2011-03-17 - 21:47 GautierHamelDeMonchenault  
PDFpdf Zee_mass_Linear_corrected.pdf r1 manage 22.9 K 2011-03-18 - 07:07 GautierHamelDeMonchenault  
PNGpng Zee_mass_Linear_corrected.png r1 manage 37.9 K 2011-03-17 - 21:48 GautierHamelDeMonchenault  
PDFpdf Zee_mass_Log_corrected.pdf r1 manage 46.1 K 2011-03-18 - 07:08 GautierHamelDeMonchenault  
PNGpng Zee_mass_Log_corrected.png r1 manage 44.2 K 2011-03-17 - 21:48 GautierHamelDeMonchenault  
PDFpdf Zmumu_lin.pdf r1 manage 22.7 K 2011-03-18 - 07:10 GautierHamelDeMonchenault  
PNGpng Zmumu_lin.png r1 manage 36.3 K 2011-03-17 - 21:49 GautierHamelDeMonchenault  
PDFpdf Zmumu_log.pdf r1 manage 50.0 K 2011-03-18 - 07:10 GautierHamelDeMonchenault  
PNGpng Zmumu_log.png r1 manage 47.1 K 2011-03-17 - 21:50 GautierHamelDeMonchenault  
PNGpng fixedMCyield_normal_model.png r1 manage 27.7 K 2011-03-17 - 17:16 GautierHamelDeMonchenault  
PDFpdf w_inc_36pb.pdf r1 manage 386.1 K 2011-03-18 - 06:59 GautierHamelDeMonchenault  
PNGpng w_inc_36pb.png r1 manage 44.0 K 2011-03-17 - 21:45 GautierHamelDeMonchenault  
PDFpdf w_inc_36pb_log.pdf r1 manage 427.8 K 2011-03-18 - 07:05 GautierHamelDeMonchenault  
PNGpng w_inc_36pb_log.png r1 manage 49.2 K 2011-03-17 - 21:46 GautierHamelDeMonchenault  
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Topic revision: r6 - 2011-03-19 - GautierHamelDeMonchenault
 
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