Search for the Higgs boson in the H → ZZ → 2l2ν channel in 1.1 fb−1

This is a condensed description with plots for the analysis CMS-HIG-11-005.

Abstract

A search for the Higgs boson in pp collisions at the LHC at a center-of-mass energy of 7 TeV is presented. The results are based on a data sample corresponding to an integrated luminosity of 1.1 fb−1 recorded by the CMS experiment. The search is conducted in the decay channel H → ZZ → 2l2ν. No excess is observed in the ZZ transverse mass. Limits are set on the production of the Higgs boson in the context of the Standard Model and in the presence of a sequential fourth family of fermions with high masses.

Main Results

We find no evidence of Standard Model Higgs boson production. We measure the 95% mean expected and observed C.L. upper limits on the cross section σ BR( H → ZZ → 2l 2ν) for masses in the range 250 − 600 GeV/c2 . Results are obtained using a CLs approach with a flat prior for the cross section, for 1.1 fb−1 . We also measure the ratio R of the 95% C.L. cross section upper limit σ to the SM cross section, σSM as a function of the Higgs mass mH. Results for the SM augmented with a 4th generation of particles are shown as well. This is the model in which the presence of another fermion family produces an enhancement of the dominant gluon-gluon fusion cross section. A scenario with fourth generation quark and lepton masses of 600 GeV/c2 is considered. With 1.1 fb−1 , Higgs masses in the range 250 − 550 GeV/c2 can be excluded.

Physics Analysis Summary

A note summarizing the analysis and the results can be found here: PAS

Figures

All public plots and tables from this analysis are collected here. Click on a figure to enlarge it, then double click to go to normal size again.
FIGURE FILES Description
met_el_11.png png, gif, pdf Missing transverse energy distribution in the electron channel at pre-selection level for 1.1 fb−1 of data.
met_mu_11.png png, gif, pdf Missing transverse energy distribution in the muon channel at pre-selection level for 1.1 fb−1 of data.
dphi_el_11.png png, gif, pdf DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the electron channel for 1.1 fb−1 of data.
dphi_mu_11.png png, gif, pdf DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the muon channel for 1.1 fb−1 of data.
mt_el_250_11.png png, gif, pdf Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1 fb−1 of data.
mt_el_350_11.png png, gif, pdf Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1 fb−1 of data.
mt_mu_250_11.png png, gif, pdf Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1 fb−1 of data.
mt_mu_350_11.png png, gif, pdf Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1 fb−1 of data.
SystematicsSummaryTable.png png, gif, pdf Summary table of all systematic uncertainties on the final event yields in percent.
FinalYieldsTable.png png, gif, pdf Summary table of the final yields for expected background and signal events, as well as observed events in 1.1/fb of data.
limits_1091pb_2.png png, gif, pdf 95% CL limit of the ratio of expected/measured cross section x BR over Standard Model for 1.1/fb of data.
limits_1091pb_4th_2.png png, gif, pdf 95% CL limit of the ratio of expected/measured cross section x BR over Standard Model+4th generation extension for 1.1/fb of data.
xs_1091pb_2.png png, gif, pdf Upper limit of the expected/measured cross section x BR for 1.1/fb of data.
xs_4th_1091pb_2.png png, gif, pdf Upper limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb of data.
event_163659_21497971_3D_black.png png, gif, pdf Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
event_163659_21497971_3D_white.png png, gif, pdf Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
event_163659_21497971_rho_phi.png png, gif, pdf Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
event_163659_21497971_rho_z.png png, gif, pdf Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif FinalYieldsTable.gif r3 r2 r1 manage 47.9 K 2011-07-20 - 18:08 PetraMerkel Summary table of final yields, 1.1/fb.
PDFpdf FinalYieldsTable.pdf r3 r2 r1 manage 61.2 K 2011-07-20 - 18:08 PetraMerkel Summary table of final yields, 1.1/fb.
PNGpng FinalYieldsTable.png r4 r3 r2 r1 manage 79.6 K 2011-07-20 - 18:08 PetraMerkel Summary table of the final yields for expected background and signal events, as well as observed events in 1.1/fb of data.
GIFgif SystematicsSummaryTable.gif r1 manage 36.2 K 2011-07-20 - 18:11 PetraMerkel Summary table of systematic uncertainties on final event yields.
PDFpdf SystematicsSummaryTable.pdf r1 manage 53.0 K 2011-07-20 - 18:11 PetraMerkel Summary table of systematic uncertainties on final event yields.
PNGpng SystematicsSummaryTable.png r1 manage 71.4 K 2011-07-20 - 18:17 PetraMerkel Summary table of systematic uncertainties on final event yields.
GIFgif dphi_el_11.gif r1 manage 11.9 K 2011-07-15 - 14:38 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the electron channel, 1.1/fb.
PDFpdf dphi_el_11.pdf r1 manage 23.1 K 2011-07-15 - 14:38 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the electron channel, 1.1/fb.
PNGpng dphi_el_11.png r1 manage 15.0 K 2011-07-15 - 09:13 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the electron channel, 1.1/fb.
GIFgif dphi_mu_11.gif r1 manage 12.2 K 2011-07-15 - 14:38 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the muon channel, 1.1/fb.
PDFpdf dphi_mu_11.pdf r1 manage 340.4 K 2011-07-15 - 14:39 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the muon channel, 1.1/fb.
PNGpng dphi_mu_11.png r1 manage 15.1 K 2011-07-15 - 09:13 PetraMerkel DeltaPhi(MET,nearest jet) after pre-selection + MET cut in the muon channel, 1.1/fb.
GIFgif event_163659_21497971_3D_black.gif r1 manage 218.1 K 2011-07-18 - 14:09 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PDFpdf event_163659_21497971_3D_black.pdf r1 manage 455.5 K 2011-07-18 - 14:09 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PNGpng event_163659_21497971_3D_black.png r1 manage 567.4 K 2011-07-18 - 14:07 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
GIFgif event_163659_21497971_3D_white.gif r1 manage 213.5 K 2011-07-18 - 14:10 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PDFpdf event_163659_21497971_3D_white.pdf r1 manage 451.4 K 2011-07-18 - 14:11 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PNGpng event_163659_21497971_3D_white.png r1 manage 568.3 K 2011-07-18 - 14:10 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
GIFgif event_163659_21497971_rho_phi.gif r1 manage 154.2 K 2011-07-18 - 14:11 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PDFpdf event_163659_21497971_rho_phi.pdf r1 manage 338.8 K 2011-07-18 - 14:12 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PNGpng event_163659_21497971_rho_phi.png r1 manage 466.0 K 2011-07-18 - 14:11 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
GIFgif event_163659_21497971_rho_z.gif r1 manage 133.3 K 2011-07-18 - 14:13 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PDFpdf event_163659_21497971_rho_z.pdf r1 manage 260.4 K 2011-07-18 - 14:12 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
PNGpng event_163659_21497971_rho_z.png r1 manage 274.2 K 2011-07-18 - 14:12 PetraMerkel Event display of the highest transverse mass event in the muon channel analysis of 1.1/fb.
GIFgif limits_1091pb_2.gif r4 r3 r2 r1 manage 14.7 K 2011-07-20 - 08:13 PetraMerkel 95% CL limit of the expected/measured cross section x BR for 1.1/fb.
PDFpdf limits_1091pb_2.pdf r3 r2 r1 manage 37.1 K 2011-07-20 - 08:13 PetraMerkel 95% CL limit of the expected/measured cross section x BR for 1.1/fb.
PNGpng limits_1091pb_2.png r3 r2 r1 manage 33.9 K 2011-07-20 - 08:14 PetraMerkel 95% CL limit of the ratio of expected/measured cross section x BR over Standard Model for 1.1/fb.
GIFgif limits_1091pb_4th_2.gif r3 r2 r1 manage 14.8 K 2011-07-20 - 08:18 PetraMerkel 95% limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
PDFpdf limits_1091pb_4th_2.pdf r3 r2 r1 manage 37.7 K 2011-07-20 - 08:19 PetraMerkel 95% CL limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
PNGpng limits_1091pb_4th_2.png r3 r2 r1 manage 34.3 K 2011-07-20 - 08:20 PetraMerkel 95% CL limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
GIFgif met_el_11.gif r1 manage 14.1 K 2011-07-15 - 14:39 PetraMerkel MET after pre-selection in electron channel, 1.1/fb.
PDFpdf met_el_11.pdf r1 manage 24.9 K 2011-07-15 - 14:40 PetraMerkel MET after pre-selection in electron channel, 1.1/fb.
PNGpng met_el_11.png r1 manage 16.8 K 2011-07-14 - 17:45 PetraMerkel MET after pre-selection in electron channel, 1.1/fb.
GIFgif met_mu_11.gif r1 manage 14.5 K 2011-07-15 - 14:40 PetraMerkel MET after pre-selection in muon channel, 1.1/fb.
PDFpdf met_mu_11.pdf r1 manage 25.0 K 2011-07-15 - 14:40 PetraMerkel MET after pre-selection in muon channel, 1.1/fb.
PNGpng met_mu_11.png r1 manage 16.7 K 2011-07-14 - 17:53 PetraMerkel MET after pre-selection in muon channel, 1.1/fb.
GIFgif mt_el_250_11.gif r1 manage 12.5 K 2011-07-15 - 14:40 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
PDFpdf mt_el_250_11.pdf r1 manage 22.9 K 2011-07-15 - 14:41 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
PNGpng mt_el_250_11.png r1 manage 16.7 K 2011-07-15 - 09:25 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
GIFgif mt_el_350_11.gif r1 manage 12.5 K 2011-07-15 - 14:41 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
PDFpdf mt_el_350_11.pdf r1 manage 23.1 K 2011-07-15 - 14:41 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
PNGpng mt_el_350_11.png r1 manage 16.1 K 2011-07-15 - 09:25 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the electron channel after all cuts except the MT-window cut, 1.1/fb.
GIFgif mt_mu_250_11.gif r1 manage 12.9 K 2011-07-15 - 14:42 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
PDFpdf mt_mu_250_11.pdf r1 manage 23.2 K 2011-07-15 - 14:42 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
PNGpng mt_mu_250_11.png r1 manage 16.8 K 2011-07-15 - 09:26 PetraMerkel Transverse mass of the LLNuNu system for the mH=250 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
GIFgif mt_mu_350_11.gif r1 manage 13.4 K 2011-07-15 - 14:42 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
PDFpdf mt_mu_350_11.pdf r1 manage 24.2 K 2011-07-15 - 14:43 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
PNGpng mt_mu_350_11.png r1 manage 16.6 K 2011-07-15 - 09:26 PetraMerkel Transverse mass of the LLNuNu system for the mH=350 GeV/c2 selection in the muon channel after all cuts except the MT-window cut, 1.1/fb.
GIFgif xs_1091pb_2.gif r3 r2 r1 manage 19.3 K 2011-07-20 - 08:21 PetraMerkel Upper limit of the expected/measured cross section x BR for 1.1/fb.
PDFpdf xs_1091pb_2.pdf r3 r2 r1 manage 45.7 K 2011-07-20 - 08:21 PetraMerkel Upper limit of the expected/measured cross section x BR for 1.1/fb.
PNGpng xs_1091pb_2.png r3 r2 r1 manage 43.1 K 2011-07-20 - 08:22 PetraMerkel Upper limit of the expected/measured cross section x BR for 1.1/fb.
GIFgif xs_4th_1091pb_2.gif r3 r2 r1 manage 19.4 K 2011-07-20 - 08:23 PetraMerkel Upper limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
PDFpdf xs_4th_1091pb_2.pdf r3 r2 r1 manage 46.4 K 2011-07-20 - 08:24 PetraMerkel Upper limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
PNGpng xs_4th_1091pb_2.png r3 r2 r1 manage 43.8 K 2011-07-20 - 08:25 PetraMerkel Upper limit of the expected/measured cross section x BR assuming a 4th generation extension of the Standard Model, for 1.1/fb.
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