Measurement of the inclusive Z → τ+τ- cross section in pp collisions at √s = 7 TeV

CMS-EWK-10-013

Abstract

A measurement of inclusive Z → τ+τ- production is presented, for the final states μ+τ-jet, e+τ-jet, e+μ, and μ+μ. The pp collision data collected in 2010 with the CMS detector is used, corresponding to an integrated luminosity of 36 inverse-picobarns √s = 7 TeV.
The cross section has been measured to be σ(pp → ZX) B(Z → τ+τ-) = 1.00 0.05(stat.) 0.08(syst.) 0.04(lumi.) nb, which is in good agreement with the next-to-next-to-leading order QCD prediction and with prior measurements in the Z → e+e- and μ+μ- channels. A global fit of the lepton+τ-jet channels provides a check on the reconstruction efficiency for semi-hadronic τ decays with a precision of ~7%.

Approved plots

Visible mass and invariant mass distributions

The data are represented by black points with errors. The signal yields (yellow histograms) result from a maximum likelihood fit.

ETau_M_lin.png MuTau_M_lin.png

Visble mass distributions in the e+τ-jet (left) and μ+τ-jet (right) channels

EMu_M_lin.png MuMu_M_log.png

Invariant mass distriibutions in the e+μ (left) and μ+μ (right) channels

Combined results in the σB versus τ-ID-efficiency plane

fit_model_Comb_ZXS_Morph_s_contour_ghm_lumi_4percent.png

Results per channel and comparison with other measurements

summary_results_powheg_mtautau_60_120_lumi_4percent.png

summary_results_ZtautauXSect_Tevatron.png

Selection plots and additional control plots

muTau_mtOS.png eTau_mtOS.png mumu_likeH_OS_DirIso_log.png

eTau_ePt.png eTau_eEta.png

eTau_tauPt.png eTau_tauEta.png

muTau_tauPt.png muTau_muEta.png

muTau_tauPt.png muTau_tauEta.png

Observation of the inclusive W → τν signal

EWK-11-002, preliminary analysis with 18 inverse-picobarns of data. The QCD muli-jet background is controlled by an ABCD method in the plane defined by two observables: a tau candidate isolation variable and a modified missing transverse energy variable HT.

TMass_A_Final.png


-- GautierHamelDeMonchenault - 18-Mar-2011

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng ABCD_template.png r1 manage 24.8 K 2011-03-20 - 08:51 GautierHamelDeMonchenault  
PNGpng B_tmass_NEW.png r1 manage 32.4 K 2011-03-20 - 08:53 GautierHamelDeMonchenault  
PNGpng C_tmass_NEW.png r1 manage 34.0 K 2011-03-20 - 08:54 GautierHamelDeMonchenault  
PNGpng D_tmass_NEW.png r1 manage 34.2 K 2011-03-20 - 08:54 GautierHamelDeMonchenault  
PDFpdf EMu_M_lin.pdf r1 manage 15.9 K 2011-03-18 - 23:11 GautierHamelDeMonchenault  
PNGpng EMu_M_lin.png r1 manage 30.9 K 2011-03-18 - 23:11 GautierHamelDeMonchenault  
PDFpdf ETau_M_lin.pdf r1 manage 16.0 K 2011-03-18 - 23:13 GautierHamelDeMonchenault  
PNGpng ETau_M_lin.png r1 manage 30.7 K 2011-03-18 - 23:13 GautierHamelDeMonchenault  
PDFpdf ETau_mtOS.pdf r1 manage 16.0 K 2011-06-16 - 14:21 MonicaVazquezAcosta  
PDFpdf MuMu_M_log.pdf r1 manage 16.2 K 2011-03-18 - 23:15 GautierHamelDeMonchenault  
PNGpng MuMu_M_log.png r1 manage 30.6 K 2011-03-18 - 23:15 GautierHamelDeMonchenault  
PDFpdf MuTau_M_lin.pdf r1 manage 16.0 K 2011-03-18 - 23:16 GautierHamelDeMonchenault  
PNGpng MuTau_M_lin.png r1 manage 30.7 K 2011-03-18 - 23:16 GautierHamelDeMonchenault  
PDFpdf TMass_A_Final.pdf r1 manage 18.9 K 2011-03-20 - 08:50 GautierHamelDeMonchenault  
PNGpng TMass_A_Final.png r1 manage 40.4 K 2011-03-20 - 09:01 GautierHamelDeMonchenault  
PDFpdf eTau_eEta.pdf r1 manage 14.7 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PNGpng eTau_eEta.png r1 manage 27.6 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PDFpdf eTau_ePt.pdf r1 manage 16.1 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PNGpng eTau_ePt.png r1 manage 31.1 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PDFpdf eTau_ePt_lin.pdf r1 manage 15.5 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PNGpng eTau_ePt_lin.png r1 manage 29.8 K 2011-03-18 - 23:12 GautierHamelDeMonchenault  
PNGpng eTau_mtOS.png r1 manage 16.6 K 2011-06-16 - 14:21 MonicaVazquezAcosta  
PDFpdf eTau_tauEta.pdf r1 manage 14.8 K 2011-03-18 - 23:13 GautierHamelDeMonchenault  
PNGpng eTau_tauEta.png r1 manage 27.7 K 2011-03-18 - 23:13 GautierHamelDeMonchenault  
PDFpdf eTau_tauPt.pdf r1 manage 16.0 K 2011-03-18 - 23:13 GautierHamelDeMonchenault  
PNGpng eTau_tauPt.png r1 manage 31.1 K 2011-03-18 - 23:14 GautierHamelDeMonchenault  
PDFpdf fit_model_Comb_ZXS_Morph_s_contour_ghm_lumi_4percent.pdf r2 r1 manage 16.0 K 2011-04-26 - 17:41 MonicaVazquezAcosta  
PNGpng fit_model_Comb_ZXS_Morph_s_contour_ghm_lumi_4percent.png r2 r1 manage 18.9 K 2011-04-26 - 17:42 MonicaVazquezAcosta  
PDFpdf muTau_mtOS.pdf r1 manage 16.1 K 2011-03-18 - 23:16 GautierHamelDeMonchenault  
PNGpng muTau_mtOS.png r1 manage 32.9 K 2011-03-18 - 23:16 GautierHamelDeMonchenault  
PDFpdf muTau_muEta.pdf r1 manage 16.2 K 2011-03-18 - 23:16 GautierHamelDeMonchenault  
PNGpng muTau_muEta.png r1 manage 29.2 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PDFpdf muTau_muPt.pdf r1 manage 15.8 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PNGpng muTau_muPt.png r1 manage 30.3 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PDFpdf muTau_muPt_lin.pdf r1 manage 15.6 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PNGpng muTau_muPt_lin.png r1 manage 30.9 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PDFpdf muTau_tauEta.pdf r1 manage 16.2 K 2011-03-18 - 23:17 GautierHamelDeMonchenault  
PNGpng muTau_tauEta.png r1 manage 29.3 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PDFpdf muTau_tauPt.pdf r1 manage 16.0 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PNGpng muTau_tauPt.png r1 manage 31.1 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PDFpdf mumu_likeH_OS_DirIso_log.pdf r1 manage 16.7 K 2011-03-18 - 23:15 GautierHamelDeMonchenault  
PNGpng mumu_likeH_OS_DirIso_log.png r1 manage 32.2 K 2011-03-18 - 23:15 GautierHamelDeMonchenault  
PDFpdf summary_results_ZtautauXSect_Tevatron.pdf r1 manage 14.8 K 2011-03-18 - 23:19 GautierHamelDeMonchenault  
PNGpng summary_results_ZtautauXSect_Tevatron.png r1 manage 28.2 K 2011-03-18 - 23:19 GautierHamelDeMonchenault  
PDFpdf summary_results_powheg_mtautau_60_120.pdf r1 manage 14.5 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PNGpng summary_results_powheg_mtautau_60_120.png r1 manage 27.6 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PDFpdf summary_results_powheg_mtautau_60_120_lumi_4percent.pdf r1 manage 14.6 K 2011-03-18 - 23:18 GautierHamelDeMonchenault  
PNGpng summary_results_powheg_mtautau_60_120_lumi_4percent.png r1 manage 26.9 K 2011-03-18 - 23:19 GautierHamelDeMonchenault  
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2011-06-16 - MonicaVazquezAcosta
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CMSPublic All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback