AtlasPublicTopicHeader.png

Expected Sensitivity in Light Charged Higgs Boson Searches for H+→τ+ν and H+→cs with Early LHC Data at the ATLAS Experiment

This page contains approved plots and results as they appear in the ATL-PHYS-PUB-2010-006 note. Only the note contains all the relevant information and should thus be consulted if one of the plots is used. Click on an image to download in eps format. Please contact the HSG Documentation manager if you find any errors on this page.


Figure 1 contains D0 and CDF results. If required, please retrieve up to date results from their respective publications.
Figure 1: The 95% confidence level upper limits on the branching ratio ${\cal B}(t \rightarrow bH^{+})$ versus $m_{H^{+}}$, assuming ${\cal B}(H^+ \rightarrow c\bar{s})=1$ (left, CDF) and ${\cal B}(H^+ \rightarrow \tau^+ \nu)=1$ (right, D0) for the charged Higgs boson. The CDF study [7] used a $2.2fb^{-1}$ dataset while the D0 study [8] used a $1 fb^{-1}$ dataset.

Figure 2: At left, the dijet mass templates (normalized to a unit area) for the reconstructed $H^{+}$ and $W$ bosons. At right, the dijet mass templates (normalized to a unit area) for $H^{+}$ and $W$ after fitting. In the fitted distributions, a cut was made on the $\chi^{2}$ of the dijet mass fitter at 10 and we require the reconstructed top top mass on the hadronic side to the smaller than 195GeV.

Figure 3: Example likelihood shape normalized to have maximum at 1 (solid line) and likelihood integral (dotted line) as a function of positive ${\cal B}(t \rightarrow bH^{+})$ for one PE. In both cases the maximum value is normalised to one. The arrow shows the position of the 95% CL upper limit from this particular PE.

Figure 4: At left, an example likelihood shape for one PE before (solid line) and after (dotted line) systematic smearing. The solid and dotted arrows show the respective 95% CL upper limit on ${\cal B}(t \rightarrow bH^{+})$ for each PE assuming a $H^+$ mass of 130GeV. The mean (solid line) is taken as the expected value given a null-Higgs hypotheis. The dotted and dashed lines show the values of ${\cal B}(t \rightarrow bH^{+})$ which contain 68% and 95% of entries respectively.

Figure 5: Left, di-jet mass as a function of the number of additional vertices in the event. The linear fit was used to derive a correction to the jet energies. Right, $W$ mass template from SM $t\bar{t}$ background events after correction of the jet energies.

Figure 6: At left, the normalized $cos\theta{}^{*}_{l}$ distribution of final state electrons and muons in dilepton $t\bar{t}$ events, coming from $W\rightarrow{}l\nu{}_{l}$ (dotted line), $W \rightarrow \tau^{+}\nu \rightarrow l^{+}\nu\bar{\nu}\nu$ (dashed line) and $H^{+} \rightarrow \tau^+\nu \rightarrow l^{+}\nu\bar{\nu}\nu$ (full line). Note that only the normalized $cos \theta^{*}_{l}$ distribution associated to $W\rightarrow l\nu_l$ follows Equation (4). At right, generator-level $cos\theta^{*}_{l}$ distribution of the final state electrons and muons in dilepton $t\bar{t}$ events, assuming a correct assignment of the various decay products, in the SM (dashed line) and with a 130GeV charged Higgs boson in the top quark decays with ${\cal B}(t \rightarrow bH^{+})$ = 17% (full line).

Figure 7: At left, the normalized $m^{H^{+}}_{T2}$ distributions for $t\bar{t}\rightarrow bW^+ \bar{b}W^- \rightarrow bl^+ \nu_l + bl^-\bar{\nu}_l$ (dotted line) and $t\bar{t}\rightarrow bW^{+}\bar{b}H^-\rightarrow bl^+\nu_l + \bar{b}\tau^- \bar{\nu}_\tau$ (full line). At right, generator-level distributions of the generalized transverse mass, assuming a correct assignment of the various decay products, in the SM (dashed line) and with a 130GeV charged Higgs boson in the top quark decays, with ${\cal B}(t \rightarrow bH^{+})$ = 17% (full line).

Figure 8: Comparison of the $cos\theta{}^{*}_{l}$ and generalized transverse mass distributions, as obtained from the scaled MC samples and the TopMixing sample in the $Z$ sideband (the $Wbb$ and $Zbb$ backgrounds are shown by the darker shaded histograms). Dilepton $t\bar{t} \rightarrow H^+ W$ events were later added to the TopMixing sample, however this sideband is not sensitive to the signal.

Figure 9: Comparison of the $cos\theta{}^{*}_{l}$ and generalized transverse mass distributions, as obtained from the scaled MC samples (with no $t\bar{t} \rightarrow H^+ W$ event) and the TopMixing sample in the $t\bar{t}$ sideband, however with no cut on $cos\theta{}^{*}_{l}$.

Figure 10: Comparison of the $cos\theta{}^{*}_{l}$ distribution in the SM case (dashed line) and as obtained when assuming $m_{H^+}$ = 130GeV together with ${\cal B}(t \rightarrow bH^{+})$ = 17% (filled histogram). All selection cuts are applied, except the one on $cos\theta{}^{*}_{l}$.
d 95% CL upper limits for ${\cal B}(t \rightarrow b H^{+})$
Figure 11: Comparison of the generalized transverse mass distributions in the SM case (dashed line) and as obtained when assuming $m_{H^+}$ = 130GeV together with ${\cal B}(t \rightarrow b H^{+})$ = 17% (filled histogram). All selection cuts are applied, except the one on $cos\theta{}^{*}_{l}$.

Figure 12: Determination of the branching ratio upper limit with (dashed line) and without (solid line) systematic uncertainties, for a 130GeV charged Higgs boson.

Figure 13: Expected 95% CL upper limits for ${\cal B}(t \rightarrow b H^{+})$ as a function of $m_{H^+}$ in ATLAS, using the early LHC data (i.e. $\int dt \mathcal{L}=200$~pb$^{-1}$ and $\sqrt{s}$ = 10TeV), in the $H^+ \rightarrow c\bar{s}$ (left) and $H^+ \rightarrow \tau^+ \nu \rightarrow l + \nu s$ (right) channels. Also shown for reference are the current Tevatron upper limits on ${\cal B}(t \rightarrow b H^{+})$. No pile-up is included here.


Major updates:
-- CalebLampen - 21-Jun-2010

Responsible: CalebLeeParnellLampenExCern
Last reviewed by: Never reviewed

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formateps BRUL-130.eps r1 manage 10.6 K 2010-06-21 - 20:21 CalebLeeParnellLampenExCern  
PNGpng BRUL-130.png r1 manage 120.7 K 2010-06-21 - 20:21 CalebLeeParnellLampenExCern  
Unknown file formateps MT2H-METbjetcuts-noData.eps r1 manage 67.0 K 2010-06-21 - 21:37 CalebLeeParnellLampenExCern  
PNGpng MT2H-METbjetcuts-noData.png r1 manage 174.8 K 2010-06-21 - 21:38 CalebLeeParnellLampenExCern  
Unknown file formateps MT2H-METbjetcuts-noSig.eps r1 manage 74.5 K 2010-06-21 - 21:38 CalebLeeParnellLampenExCern  
PNGpng MT2H-METbjetcuts-noSig.png r1 manage 150.5 K 2010-06-21 - 21:38 CalebLeeParnellLampenExCern  
Unknown file formateps MT2H-ZSB-noSig.eps r1 manage 51.7 K 2010-06-21 - 21:39 CalebLeeParnellLampenExCern  
PNGpng MT2H-ZSB-noSig.png r1 manage 158.1 K 2010-06-21 - 21:39 CalebLeeParnellLampenExCern  
Unknown file formateps MT2W-METbjetcuts-noData.eps r1 manage 64.2 K 2010-06-21 - 21:39 CalebLeeParnellLampenExCern  
PNGpng MT2W-METbjetcuts-noData.png r1 manage 177.2 K 2010-06-21 - 21:40 CalebLeeParnellLampenExCern  
Unknown file formateps MT2W-METbjetcuts-noSig.eps r1 manage 78.7 K 2010-06-21 - 21:40 CalebLeeParnellLampenExCern  
PNGpng MT2W-METbjetcuts-noSig.png r1 manage 160.6 K 2010-06-21 - 21:40 CalebLeeParnellLampenExCern  
Unknown file formateps MT2W-ZSB-noSig.eps r1 manage 58.8 K 2010-06-21 - 21:41 CalebLeeParnellLampenExCern  
PNGpng MT2W-ZSB-noSig.png r1 manage 146.1 K 2010-06-21 - 21:41 CalebLeeParnellLampenExCern  
Unknown file formateps T09JF2a.eps r1 manage 9.8 K 2010-06-21 - 21:45 CalebLeeParnellLampenExCern  
PNGpng T09JF2a.png r1 manage 107.9 K 2010-06-21 - 21:45 CalebLeeParnellLampenExCern  
Unknown file formateps TestFitChiMtopTemplate.eps r1 manage 8.4 K 2010-06-21 - 21:45 CalebLeeParnellLampenExCern  
PNGpng TestFitChiMtopTemplate.png r1 manage 119.0 K 2010-06-21 - 21:45 CalebLeeParnellLampenExCern  
Unknown file formateps TestFitChiMtopTemplate_pileup-corr_atlas.eps r1 manage 9.5 K 2010-06-21 - 21:46 CalebLeeParnellLampenExCern  
PNGpng TestFitChiMtopTemplate_pileup-corr_atlas.png r1 manage 118.1 K 2010-06-21 - 21:46 CalebLeeParnellLampenExCern  
Unknown file formateps TestUnfitTemplate.eps r1 manage 9.8 K 2010-06-21 - 21:46 CalebLeeParnellLampenExCern  
PNGpng TestUnfitTemplate.png r1 manage 138.3 K 2010-06-21 - 21:46 CalebLeeParnellLampenExCern  
Unknown file formateps cdf_leptophobic_limits.eps r1 manage 11.5 K 2010-06-21 - 20:21 CalebLeeParnellLampenExCern  
PNGpng cdf_leptophobic_limits.png r1 manage 263.6 K 2010-06-21 - 20:21 CalebLeeParnellLampenExCern  
Unknown file formateps cosH-METbjetcuts-noData.eps r1 manage 34.8 K 2010-06-21 - 20:22 CalebLeeParnellLampenExCern  
PNGpng cosH-METbjetcuts-noData.png r1 manage 152.9 K 2010-06-21 - 20:22 CalebLeeParnellLampenExCern  
Unknown file formateps cosH-METbjetcuts-noSig.eps r1 manage 46.4 K 2010-06-21 - 20:22 CalebLeeParnellLampenExCern  
PNGpng cosH-METbjetcuts-noSig.png r1 manage 138.7 K 2010-06-21 - 20:23 CalebLeeParnellLampenExCern  
Unknown file formateps cosH-ZSB-noSig.eps r1 manage 50.2 K 2010-06-21 - 20:23 CalebLeeParnellLampenExCern  
PNGpng cosH-ZSB-noSig.png r1 manage 137.3 K 2010-06-21 - 20:26 CalebLeeParnellLampenExCern  
Unknown file formateps cosW-METbjetcuts-noData.eps r1 manage 37.2 K 2010-06-21 - 21:32 CalebLeeParnellLampenExCern  
PNGpng cosW-METbjetcuts-noData.png r1 manage 156.3 K 2010-06-21 - 21:32 CalebLeeParnellLampenExCern  
Unknown file formateps cosW-METbjetcuts-noSig.eps r1 manage 38.0 K 2010-06-21 - 21:32 CalebLeeParnellLampenExCern  
PNGpng cosW-METbjetcuts-noSig.png r1 manage 128.6 K 2010-06-21 - 21:32 CalebLeeParnellLampenExCern  
Unknown file formateps cosW-ZSB-noSig.eps r1 manage 60.5 K 2010-06-21 - 21:33 CalebLeeParnellLampenExCern  
PNGpng cosW-ZSB-noSig.png r1 manage 135.3 K 2010-06-21 - 21:33 CalebLeeParnellLampenExCern  
Unknown file formateps csbar_limits.eps r1 manage 10.3 K 2010-06-21 - 21:33 CalebLeeParnellLampenExCern  
PNGpng csbar_limits.png r1 manage 179.8 K 2010-06-21 - 21:34 CalebLeeParnellLampenExCern  
Unknown file formateps dilept-results.eps r1 manage 10.8 K 2010-06-21 - 21:34 CalebLeeParnellLampenExCern  
PNGpng dilept-results.png r1 manage 133.0 K 2010-06-21 - 21:34 CalebLeeParnellLampenExCern  
Unknown file formateps fit_br.eps r1 manage 7.8 K 2010-06-21 - 21:35 CalebLeeParnellLampenExCern  
PNGpng fit_br.png r1 manage 146.5 K 2010-06-21 - 21:35 CalebLeeParnellLampenExCern  
Unknown file formateps lh_nosmear.eps r1 manage 9.0 K 2010-06-21 - 21:35 CalebLeeParnellLampenExCern  
PNGpng lh_nosmear.png r1 manage 136.3 K 2010-06-21 - 21:36 CalebLeeParnellLampenExCern  
Unknown file formateps lh_smear.eps r1 manage 9.6 K 2010-06-21 - 21:36 CalebLeeParnellLampenExCern  
PNGpng lh_smear.png r1 manage 138.3 K 2010-06-21 - 21:36 CalebLeeParnellLampenExCern  
Unknown file formateps mjj_smtt_nvtx_fit_atlas.eps r1 manage 9.3 K 2010-06-21 - 21:37 CalebLeeParnellLampenExCern  
PNGpng mjj_smtt_nvtx_fit_atlas.png r1 manage 97.3 K 2010-06-21 - 21:37 CalebLeeParnellLampenExCern  
Unknown file formateps plot_ang_nocut.eps r1 manage 11.1 K 2010-06-21 - 21:41 CalebLeeParnellLampenExCern  
PNGpng plot_ang_nocut.png r1 manage 160.8 K 2010-06-21 - 21:41 CalebLeeParnellLampenExCern  
Unknown file formateps plot_ang_norm.eps r1 manage 13.4 K 2010-06-21 - 21:42 CalebLeeParnellLampenExCern  
PNGpng plot_ang_norm.png r1 manage 174.0 K 2010-06-21 - 21:42 CalebLeeParnellLampenExCern  
Unknown file formateps plot_mt2gen_nocutnew.eps r1 manage 12.7 K 2010-06-21 - 21:43 CalebLeeParnellLampenExCern  
PNGpng plot_mt2gen_nocutnew.png r1 manage 215.3 K 2010-06-21 - 21:43 CalebLeeParnellLampenExCern  
Unknown file formateps plot_mt2gen_normnew.eps r1 manage 14.1 K 2010-06-21 - 21:44 CalebLeeParnellLampenExCern  
PNGpng plot_mt2gen_normnew.png r1 manage 231.6 K 2010-06-21 - 21:44 CalebLeeParnellLampenExCern  
Edit | Attach | Watch | Print version | History: r5 < r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r5 - 2011-01-26 - PatrickJussel
 
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    Atlas All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback