Search for the light charged Higgs boson in top quark decays in pp collisions at sqrt(s) = 7 TeV

This is a condensed description with plots for the analysis CMS-HIG-11-019

Abstract

Results are presented on a search for a light charged Higgs boson that can be produced in the decay of the top quark t -> H+ b and which, in turn, decays into tau nu. The analysed data correspond to an integrated luminosity of about 2 fb-1 recorded in proton-proton collisions at sqrt(s) = 7 TeV by the CMS experiment at the LHC. The search is sensitive to the decays of the top quark pairs t tbar -> H+ W- b bbar and t tbar -> H+ H- b bbar. Various final states have been studied separately, all requiring presence of a tau lepton from H+ decays, missing transverse energy, and multiple jets. Upper limits on the branching fraction B(t -> H+ b) in the range of 2-4 % are established for charged Higgs boson masses between 80 and 160 GeV, under the assumption that B(H+ -> tau nu) = 1.

Main Results

The search for the light charged Higgs boson (mH+ < mt) produced from the top quark decay t -> H+b and decaying into tau+ nu has been performed using about 1 fb-1 of data collected in proton-proton collisions at sqrt(s)=7 TeV. The fully hadronic, lepton-tau, and e-mu final state toplogies have been analysed and the upper limit 2-4 % on the B(t -> H+b) has been obtained for the Higgs boson mass interval 80 < mH+ < 160 GeV/c2 assuming Br(H+ -> tau+ nu)=1.

Figures from CMS-HIG-11-019

Figure Label Description
Figure 1 (left) png, pdf Representative diagram for the tau_h+jets final state.
Figure 1 (middle) png, pdf Representative diagram for the e (mu) tau_h final state.
Figure 1 (right) png, pdf Representative diagram for the e mu final state.
Figure 2 png, eps, pdf The event yield after each selection step for the tau_h+jets analysis. The expected event yield in the presence of the t -> H+b, H+ -> tau nu decays is shown as the dashed line for mH+=120 GeV/c2 and under that assumption that B(t -> H+b)=0.05. The multi-jet background and the "EWK+t tbar tau" backgrounds are measured from the data. The bottom panel shows the ratio of data over background along with the total uncertainties. Statistical and systematic uncertainties are added in quadrature.
Figure 3 png, eps, pdf The transverse mass of tau jet and ETmiss after full event selection for the tau_h+jets analysis. The expected event yield in the presence of the t -> H+b, H+ -> tau nu decays is shown as the dashed line for mH+=120 GeV/c2 and under the assumption that B(t -> H+b)=0.05. The bottom panel shows the ratio of data over background along with the total uncertainties. The ratio is not shown for mT > 160 GeV, where the expected total number of background events is 2.5 +- 0.3 while 5 events are observed. Statistical and systematic uncertainties are added in quadrature.
Figure 4 (left) png, eps, pdf The event yields after each selection step for the e tau_h analysis. The backgrounds are estimated from simulation and normalized to the standard model prediction. The expected event yield in the presence of the t -> H+b, H+ -> tau nu decays is shown as the dashed line for mH+=120 GeV/c2 and under the assumption B(t -> H+b)=0.05. The bottom panel shows the ratio of data over background along with the total uncertainties. OS indicates the requirement to have opposite electric charges for a tau_h and an e. Statistical and systematic uncertainties are added in quadrature.
Figure 4 (right) png, eps, pdf The event yields after each selection step for the mu tau_h analysis. The backgrounds are estimated from simulation and normalized to the standard model prediction. The expected event yield in the presence of the t -> H+b, H+ -> tau nu decays is shown as the dashed line for mH+=120 GeV/c2 and under the assumption B(t -> H+b)=0.05. The bottom panel shows the ratio of data over background along with the total uncertainties. OS indicates the requirement to have opposite electric charges for a tau_h and a mu. Statistical and systematic uncertainties are added in quadrature.
Figure 5 png, eps, pdf The event yield after each selection step for the e mu analysis. The backgrounds are from simulation and normalized to the standard model prediction. The expected event yield in the presence of the t -> H+b, H+ -> tau nu decays is shown as the dashed line for mH+=120 GeV/c2 under the assumption that B(t -> H+b)=0.05. The bottom panel shows the ratio of data over background along with the total uncertainties. OS indicates the requirement to have opposite electric charges for a tau_h and a mu. Statistical and systematic uncertainties are added in quadrature.
Figure 6 (left) png, eps, pdf The expected number of t tbar events after the event selection for mu tau final state as a function of the branching ratio B(t -> H+ b) for mH+=120 GeV/c2. Expectations are shown separately for WH, HH, and WW contributions.
Figure 6 (right) png, eps, pdf The expected number of t tbar events after the event selection for e mu final state as a function of the branching ratio B(t -> H+ b) for mH+=120 GeV/c2. Expectations are shown separately for WH, HH, and WW contributions.
Figure 7 (left) png, eps, pdf Upper limit on B(t -> H+b) as a function of mH+ for the fully hadronic final state. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.
Figure 7 (right) png, eps, pdf Upper limit on B(t -> H+b) as a function of mH+ for the e tau final state. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.
Figure 8 (left) png, eps, pdf Upper limit on B(t -> H+b) as a function of mH+ for the mu tau final state. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.
Figure 8 (right) png, eps, pdf Upper limit on B(t -> H+b) as a function of mH+ for the e mu final state. he +-1 sigma and +-2 sigma bands around the expected limit are also shown.
Figure 9 (left) png, eps, pdf The upper limit on B(t -> H+b) as a function of mH+ obtained from the combination of the all final states. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.
Figure 9 (right) png, eps, pdf The exclusion region in the MSSM mH+ - tan beta parameter space obtained from the combined analysis for the MSSM mh-max scenario. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.

Tables from CMS-HIG-11-019

Table Label Description
Table 1 png Number of expected events in the tau_h+jets analysis for the backgrounds and the Higgs boson signal from HH and WH processes at mH+=120 GeV/c2, and the number of observed events after the final event selection. Unless stated differently, the expected backgrounds are from simulation.
Table 2 png Number of expected events in the e tau_h and mu tau_h analyses for the backgrounds and the Higgs boson signal from WH and HH processes at mH+=120 GeV/c2, and the number of observed events after the final event selection. Unless stated differently, the expected backgrounds are from simulation.
Table 3 png Number of expected events in the e mu analysis for the backgrounds, the Higgs boson signal from HH and WH processes at mH+=120 GeV/c2, and the number of observed events after all selection requirements. Unless stated differently, the expected backgrounds are from simulation.
Table 4 png The systematic uncertainties on the event yields (in percent) in the tau_h+jets analysis for backgrounds processes and for the Higgs boson signal processes WH and HH in the range mH+=80-160 GeV.
Table 5 png The systematic uncertainties on the event yields (in percent)in the mu_h tau analysis for the backgrounds and for the Higgs boson signal processes WH and HH for mH+=120 GeV.
Table 6 png The systematic uncertainties on the event yields (in percent) in the e mu analysis for the backgrounds and for the Higgs boson signal processes WH and HH for mH+=120 GeV.
Table 7 png The expected range and observed 95 % CL upper limit for B(t -> H+b) as a function of mH+ for the combination of the fully hadronic, mu tau_h, e tau_h, and the e mu final states.

Additional plots for public talks (fully hadronic final state)

Figure Label Description
Figure 1 png, eps, pdf The QCD transverse mass shape without DeltaPhi cut, normalised to unit area. The shaded histograms (cross-shaped markers) represent the shape with (without) the b-tagging cut applied.
Figure 2 png, eps, pdf The QCD transverse mass shape for DeltaPhi < 160, normalised to unit area. The shaded histograms (cross-shaped markers) represent the shape with (without) the b-tagging cut applied.
Figure 3 png, eps, pdf The QCD transverse mass shape for DeltaPhi < 130, normalised to unit area. The shaded histograms (cross-shaped markers) represent the shape with (without) the b-tagging cut applied.
Figure 4 png, eps, pdf Distribution of the selected muon pT after the mu + 3 jets control sample selection (including muon isolation).
Figure 5 png, eps, pdf Distribution of transverse mass for DeltaPhi < 160 for embedded data and embedded simulation.
Figure 6 png, eps, pdf Distribution of transverse mass for DeltaPhi < 160 for embedded data + residual (DY+WW) MC, embedded MC + residual MC, and normal MC. In the ratio part, (embedded data+residual MC)/(normal MC) is shown in black dots, and (embedded MC+residual MC)/(normal MC) is shown in blue squares.
Figure 7 png, eps, pdf Distributions of MET for the data and measured backgrounds after tau identification, lepton veto, and requirement of three hadronic jets. The expected event yield in the presence of the t -> H+b, H+ -> taunu decays is shown as the dashed red line for mH+ = 120 GeV/c2 and ssuming BR(t->H+b) = 0.05 and BR(H+ -> taunu) = 1.
Figure 8 png, eps, pdf Distributions of the number of selected b jets for the data and measured backgrounds after tau identification, lepton veto, requirement of three hadronic jets, and MET cut. The expected event yield in the presence of the t -> H+b, H+ -> taunu decays is shown as the dashed red line for mH+ = 120 GeV/c2 and ssuming BR(t->H+b) = 0.05 and BR(H+ -> taunu) = 1.
Figure 9 png, eps, pdf Distributions of the DeltaPhi(tau jet, MET) for the data and measured backgrounds after tau identification, lepton veto, requirement of three hadronic jets, MET cut, and requirement of at least one tagged b jet. The expected event yield in the presence of the t -> H+b, H+ -> taunu decays is shown as the dashed red line for mH+ = 120 GeV/c2 and ssuming BR(t->H+b) = 0.05 and BR(H+ -> taunu) = 1.

Additional plots for public talks (lepton-tau final states)

Figure Label Description
Figure 1 png, eps, pdf pT distribution of selected muon after the selection of one muon and 3 jets (two jets with pT > 30 GeV/c and one jet with pT > 20 GeV/c)
Figure 2 png, eps, pdf eta distribution of selected muon after the selection of one muon and 3 jets (two jets with pT > 30 GeV/c and one jet with pT > 20 GeV/c)
Figure 3 png, eps, pdf Distribution for pT of selected tau hadronic jet after the selection of one muon, 3 jets (two jets with pT > 30 GeV/c and one jet with pT > 20 GeV/c), Missing ET > 40 GeV and one jet tagged as b-jet.
Figure 4 png, eps, pdf Distribution for eta of selected tau hadronic jet after the selection of one muon, 3 jets (two jets with pT > 30 GeV/c and one jet with pT > 20 GeV/c), Missing ET > 40 GeV and one jet tagged as b-jet.
Figure 5 png, eps, pdf Distribution for pT of selected tau hadronic jet after the selection of one electron, 3 jets (two jets with pT > 35 GeV/c and one jet with pT > 20 GeV/c), Missing ET > 45 GeV and one jet tagged as b-jet.
, Figure 6 png, eps, pdf Distribution for eta of selected tau hadronic jet after the selection of one electron, 3 jets (two jets with pT > 35 GeV/c and one jet with pT > 20 GeV/c), Missing ET > 45 GeV and one jet tagged as b-jet.
Figure 7 png, eps, pdf Distribution for tau polarization of selected 1-prong tau hadronic jet after the selection of one muon, 3 jets (two jets with pT > 30 GeV/c and one jet with pT > 20 GeV/c), Missing ET > 40 GeV and one jet tagged as b-jet
Figure 8 png, eps, pdf Distribution for the probability of a jet mis-tagged as a tau hadronic jet evaluated from QCD multijet type events. Tau jet is required to pass HPS Medium isolation and loose muon and medium electron rejection and pT > 20 GeV
Figure 9 png, eps, pdf Distribution for the probability of a jet mis-tagged as a tau hadronic jet evaluated from W+jet type events. Tau jet is required to pass HPS Medium isolation and loose muon and medium electron rejection and pT > 20 GeV

Additional plots for public talks (combined limit)

Figure Label Description
Figure 1 png, eps, pdf The exclusion region in the MSSM mA - tan beta parameter space obtained from the combined analysis for the MSSM mh-max scenario. The +-1 sigma and +-2 sigma bands around the expected limit are also shown.

Additional tables for public talks (lepton-tau final states)

Figure Label Description
Table 1 pdf, png Estimated fake tau backgrounds using the data driven method in mu-tau channel
Table 2 pdf, png Estimated fake tau backgrounds using the data driven method in e-tau channel
Table 3 pdf, eps, png Systematic uncertainties for backgrounds and signal events in e-tau channel
Topic attachments
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Topic revision: r13 - 2014-09-09 - SanteriLaurila
 
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