ATLAS Sensitivity Prospects for Higgs Boson Production at the LHC Running at 7 TeV

This page contains approved plots and results as they appear in the ATL-PHYS-PUB-2010-009 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.


Please note that the attached eps files can be retrieved by clicking on the appropriate images. The figure numbers on this page should match those from the pub note. However, the attached files are potentially from disparate sources, and the downloaded file names may be misleading. For example figure5a.eps is the file used for figure 7 in the original pub note.


Figure 1: Representative leading order diagrams of Standard Model Higgs boson production. Note: Usual eps image linked to above is very large (19MB). Alternative pdf file is available.

Figure 2: Production cross-sections of the SM Higgs boson in $pp$ collisions as functions of $M_H$ for centre-of-mass energies of 7, 10 and 14 TeV.

Figure 3: Relative NLO cross-sections from MCFM [12] as functions of $\sqrt{s}$ for the signal ($M_H$ = 160 GeV) and main background processes.

Figure 4: Tree-level Feynman diagrams for the neutral MSSM Higgs boson production via (a) gluon fusion and (b) the associated production with _b_-quarks

Figure 5: $H\rightarrow ZZ \rightarrow 4\mu$ signal selection efficiency as a function of the selection step for the luminosity scenario B, as defined in Table 3. The open boxes correspond to the case without pile-up and cavern background. The dark solid circles correspond to the sample with pile-up and cavern background, with a track isolation requirement along the lines of the reference analysis at $\sqrt{s}$ = 14 TeV. The pale circles correspond to the pile-up case with the improved track isolation requirement.

Figure 6: Expected 95% CL upper limits on $\sigma_H \times {\mathcal B}(H\to WW)$ in pb. The left plot shows the conservative systematic uncertainty assumptions for different integrated luminosity scenarios. The right plot has green and yellow bands representing the range in which we expect the limit will lie, depending upon the data and lines showing conservative and optimistic uncertainty scenarios. The Standard Model cross-section is shown a red dotted line.

Figure 7: Expected 95% CL upper limits of the Higgs boson production cross-section normalized to the cross-section predicated by the Standard Model. Left: for different integrated luminosity scenarios at $\sqrt{s}$ = 7 TeV and conservative systematic uncertainty assumptions. Right: the green and yellow bands represent the range in which we eexpect the limit will lie, depending upon the data, normalised to the SM cross-section for an integrated luminosity of 1 fb-1. The effect of conservative and optimistic systematic uncertainties is indicated.

Figure 8: Comparison of the lepton $p_T$ and $\eta$ distributions from $H \rightarrow ZZ^{(*)}\rightarrow 4 \ell$ decays, with $M_H$ = 130 GeV, at $\sqrt{s}$ = 7 TeV. Similar agreement is observed for the sub-leading leptons.

Figure 9: Left plot: distributions of the maximum impact parameter significance of the signal and the $Zb\bar{b}$ background in the $H \rightarrow 4 \mu$ channel. Right plot: invariant mass resolution for the $H \rightarrow 4 \mu$ channel as function of the Higgs mass, before and after applying the $Z$ mass constraint.

Figure 10: Expected 95% CL upper limits on the Standard Model Higgs boson production in the $H \rightarrow ZZ^{(*)} \rightarrow 4\ell$ channel as a function of the Higgs mass, for the 7 TeV centre-of-mass energy. The bands indicate the range in which we expect the limit will lie, depending upon the data. These limits were obtained with the CLs method used in LEP and Tevatron experiments [35].

Figure 11: Examples of Feynmandiagrams of photon pair production, at the lowest order (LO) in terms of $\alpha_s$.

Figure 12: Invariant mass of hte two candidate photons from MC samples simulating the production of a Higgs boson with $m_H$ = 120 GeV through all production channels, normalised to L = 1 fb-1 at 7 TeV. Also shown is the distribution when at least one photon is converted according to the Monte Carlo truth.

Figure 13: Expected di-photon invariant mass distribution at $\sqrt{s}$ = 7 TeV for an integrated luminosity of 1 fb-1. The left-hand plot has the signal contribution enhanced by a factor 10.

Figure 14: The estimated number of Standard Model signal cross-section excluded at 95% CL as a function of the Higgs mass for an integrated luminosity of 1 fb-1. The Frequentist limit shown allows the observed upper limit to be zero (top plot). For comparison, on the bottom plot, we show the limit with the CLs method used at LEP and Tevatron experiments [35]. The green and yellow bands represent the range in which we expect the limit with lie, depending upon the data.

Figure 15: The expected upper bound on the Higgs boson production cross-section after collecting 1 fb-1 of integrated luminosity in 7 TeV collisions with the ATLAS detector: on the top plot, the limit is normalised to the NLO prediction of the SM cross-section and on the bottom plot, it is normalised to an absolute cross-section. The green and yellow bands represent the rane in which we expect the limit will lie, depending upon the data. Only the $H \rightarrow WW \rightarrow \ell\ell\nu\nu$, $H \rightarrow ZZ \rightarrow 4 \ell $ and $H \rightarrow \gamma\gamma$ channels are included in these plots. It is expected that in the low mass region, the addition of $H \rightarrow b \bar{b}$ and $H \rightarrow \tau \tau$ will improve this result. The expected limit in high mass region above $M_H$ ~ 200 GeV is obtained from the $H \rightarrow ZZ \rightarrow 4 \ell$ only as shown in Fig. 10; the limit in the high mass region will be improved with the addition of the $H \rightarrow ZZ \rightarrow \ell \ell b b$ and $H \rightarrow ZZ \rightarrow \ell \ell \nu \nu$ channels.

Figure 16: Left: the normalised di-jet mass templates directly reconstructed from the two untagged jets. Right: the improved, normalised di-jet mass templates using the fitter.

Figure 17: Comparison of the $cos \theta^{*}_{\ell}$ distribution on the $H^+$ side in the SM case (dashed line) and as obtained when assuming $m_{H^+}$ = 130 GeV together with ${\mathcal B}(t \to b H^+)$ = 17% (filled histogram). All selection cuts are applied, except the one on $cos \theta^*_\ell$.

Figure 18: Expected 95% CL upper limits in early data ( with L = 1 fb-1) at $sqrt{s}$ = 7 TeV) versus the charged Higgs boson mass assuming ${\mathcal B}(H^+ \to \tau^+ \nu)$ = 1 (left) or ${\mathcal B}(H^+ \to c \bar{s})$ = 1 (right). The green and yellow bands correspond to the range in which we expect the limit will lie, depending upon the data.

Figure 19: Transverse momentum distributions of the generated $b$-quarks in the $bbA$ signal events, shown for three different centre-of-mass energies.

Figure 20: The tanβ balues needed for an exclusion of the neutral MSSM Higgs bosons shown as a function o fthe Higgs boson mass $m_A$, separately for teh (left) analysis mode with 0 $b$-jet and (right) analysis mode with at least on $b$-jet. An integrated luminosity of 1 fb-1 and $\sqrt{s}$ = 7 TeV are assumed. Dashed lines represent the results assuming zero uncertainty on the signal and background, while the full lines correspond to the results with both signal and background uncertainty taken in to account.

Figure 21: The pseudo-rapidity distribution of the leading jet in QCD di-jet events at 10 TeV (black) and at 7 TeV using PDF re-weighting (red) and using a dedicated, fully simulated sample of Monte Carlo events generated with a centre-of-mass energy of 7 TeV and using the same PDF set as the 10 TeV sample (blue).

Figure 22: A comparison of the expected (median) limits for $H \to WW$ using PDF re-weighting and using cross-section rescaling, for an integraed luminosity of 1 fb-1.

Major updates:
-- CalebLampen - 19-Jul-2010

Responsible: Main.unknown
Last reviewed by: Never reviewed

Topic attachments
I Attachment History ActionSorted ascending Size Date Who Comment
Unknown file formateps ATL-PHYS-PUB-2010-009-Fig1.eps r1 manage 19200.6 K 2010-07-19 - 20:59 UnknownUser  
PDFpdf ATL-PHYS-PUB-2010-009-Fig1.pdf r1 manage 22.8 K 2010-07-19 - 20:55 UnknownUser  
PNGpng ATL-PHYS-PUB-2010-009-Fig1.png r1 manage 531.5 K 2010-07-19 - 20:11 UnknownUser  
Unknown file formateps CrossSectionRatio.eps r1 manage 8.8 K 2010-07-19 - 20:25 UnknownUser  
PNGpng CrossSectionRatio.png r1 manage 113.8 K 2010-07-19 - 20:25 UnknownUser  
Unknown file formateps CutFlow_d153.eps r1 manage 9.3 K 2010-07-19 - 06:04 UnknownUser  
PNGpng CutFlow_d153.png r1 manage 139.9 K 2010-07-19 - 06:04 UnknownUser  
Unknown file formateps Eta130MC0.eps r1 manage 10.5 K 2010-07-19 - 06:25 UnknownUser  
PNGpng Eta130MC0.png r1 manage 193.1 K 2010-07-19 - 06:25 UnknownUser  
Unknown file formateps Figure3a.eps r1 manage 12.1 K 2010-07-19 - 20:32 UnknownUser  
PNGpng Figure3a.png r1 manage 205.2 K 2010-07-19 - 20:33 UnknownUser  
Unknown file formateps Figure4.eps r1 manage 12.5 K 2010-07-19 - 20:34 UnknownUser  
PNGpng Figure4.png r1 manage 203.7 K 2010-07-19 - 20:34 UnknownUser  
Unknown file formateps Figure5a.eps r1 manage 10.2 K 2010-07-19 - 20:38 UnknownUser  
PNGpng Figure5a.png r1 manage 185.8 K 2010-07-19 - 20:38 UnknownUser  
Unknown file formateps Figure6.eps r1 manage 10.1 K 2010-07-19 - 20:38 UnknownUser  
PNGpng Figure6.png r1 manage 175.9 K 2010-07-19 - 20:39 UnknownUser  
Unknown file formateps H120_7TeVsamples_1invfb.eps r1 manage 32.1 K 2010-07-19 - 06:42 UnknownUser  
PNGpng H120_7TeVsamples_1invfb.png r1 manage 150.1 K 2010-07-19 - 06:43 UnknownUser  
Unknown file formateps HiggsXS10TeVMass_noVBF_sChannel.eps r1 manage 11.8 K 2010-07-19 - 05:39 UnknownUser  
PNGpng HiggsXS10TeVMass_noVBF_sChannel.png r1 manage 141.8 K 2010-07-19 - 05:38 UnknownUser  
Unknown file formateps HiggsXS14TeVMass_noVBF_sChannel.eps r1 manage 11.8 K 2010-07-19 - 05:40 UnknownUser  
PNGpng HiggsXS14TeVMass_noVBF_sChannel.png r1 manage 142.1 K 2010-07-19 - 05:38 UnknownUser  
Unknown file formateps HiggsXS7TeVMass_noVBF_sChannel.eps r1 manage 11.9 K 2010-07-19 - 05:38 UnknownUser  
PNGpng HiggsXS7TeVMass_noVBF_sChannel.png r1 manage 141.9 K 2010-07-19 - 05:39 UnknownUser  
Unknown file formateps HmassResol4mu.eps r1 manage 9.0 K 2010-07-19 - 06:31 UnknownUser  
PNGpng HmassResol4mu.png r1 manage 121.8 K 2010-07-19 - 06:33 UnknownUser  
Unknown file formateps IPS4muDistribution.eps r1 manage 9.2 K 2010-07-19 - 06:36 UnknownUser  
PNGpng IPS4muDistribution.png r1 manage 116.1 K 2010-07-19 - 06:36 UnknownUser  
Unknown file formateps PlotCLSB_7TeV1fb_noC2_text.eps r1 manage 12.3 K 2010-07-19 - 07:00 UnknownUser  
PNGpng PlotCLSB_7TeV1fb_noC2_text.png r1 manage 133.3 K 2010-07-19 - 07:01 UnknownUser  
Unknown file formateps PlotCLS_7TeV1fb_noC2_text.eps r1 manage 11.3 K 2010-07-19 - 21:36 UnknownUser  
PNGpng PlotCLS_7TeV1fb_noC2_text.png r1 manage 129.0 K 2010-07-19 - 21:37 UnknownUser  
Unknown file formateps PlotFig2_toy.eps r1 manage 29.5 K 2010-07-19 - 06:47 UnknownUser  
PNGpng PlotFig2_toy.png r1 manage 249.4 K 2010-07-19 - 06:48 UnknownUser  
Unknown file formateps Plot_Fig1.eps r1 manage 13.3 K 2010-07-19 - 21:32 UnknownUser  
PNGpng Plot_Fig1.png r1 manage 150.1 K 2010-07-19 - 21:32 UnknownUser  
Unknown file formateps Pt130MC0.eps r1 manage 11.6 K 2010-07-19 - 06:26 UnknownUser  
PNGpng Pt130MC0.png r1 manage 205.5 K 2010-07-19 - 06:27 UnknownUser  
Unknown file formateps TestFitChiMtopTemplate.eps r1 manage 8.6 K 2010-07-19 - 07:14 UnknownUser  
PNGpng TestFitChiMtopTemplate.png r1 manage 123.9 K 2010-07-19 - 07:15 UnknownUser  
Unknown file formateps TestUnfitTemplate.eps r1 manage 10.1 K 2010-07-19 - 07:13 UnknownUser  
PNGpng TestUnfitTemplate.png r1 manage 143.5 K 2010-07-19 - 07:14 UnknownUser  
PNGpng UnfitTemplate7tev.png r1 manage 114.3 K 2010-07-19 - 04:41 UnknownUser  
Unknown file formateps WW_comparison_7TeV_1ifb_11Jun2010.eps r1 manage 11.3 K 2010-07-19 - 07:37 UnknownUser  
PNGpng WW_comparison_7TeV_1ifb_11Jun2010.png r1 manage 137.9 K 2010-07-19 - 07:38 UnknownUser  
Unknown file formateps ah_prod.eps r1 manage 28.1 K 2010-07-19 - 06:12 UnknownUser  
PNGpng ah_prod.png r1 manage 33.2 K 2010-07-19 - 06:12 UnknownUser  
Unknown file formateps b_quark_pt.eps r1 manage 14.6 K 2010-07-19 - 07:29 UnknownUser  
PNGpng b_quark_pt.png r1 manage 182.7 K 2010-07-19 - 07:29 UnknownUser  
Unknown file formateps cosH-METbjetcuts-noData-7TeV.eps r1 manage 35.5 K 2010-07-19 - 07:18 UnknownUser  
PNGpng cosH-METbjetcuts-noData-7TeV.png r1 manage 151.4 K 2010-07-19 - 07:19 UnknownUser  
Unknown file formateps csbar_limits.eps r1 manage 10.7 K 2010-07-19 - 07:23 UnknownUser  
PNGpng csbar_limits.png r1 manage 169.8 K 2010-07-19 - 07:23 UnknownUser  
Unknown file formateps diagram_irr_pythia.eps r1 manage 18.2 K 2010-07-19 - 06:40 UnknownUser  
PNGpng diagram_irr_pythia.png r1 manage 57.6 K 2010-07-19 - 06:40 UnknownUser  
Unknown file formateps h4lLimit7TeV.eps r1 manage 35.6 K 2010-07-19 - 06:38 UnknownUser  
PNGpng h4lLimit7TeV.png r1 manage 160.1 K 2010-07-19 - 06:38 UnknownUser  
Unknown file formateps label_0b_tanb_excl.eps r1 manage 11.3 K 2010-07-19 - 07:31 UnknownUser  
PNGpng label_0b_tanb_excl.png r1 manage 139.4 K 2010-07-19 - 07:31 UnknownUser  
Unknown file formateps label_1b_tanb_excl.eps r1 manage 11.4 K 2010-07-19 - 07:33 UnknownUser  
PNGpng label_1b_tanb_excl.png r1 manage 144.7 K 2010-07-19 - 07:32 UnknownUser  
Unknown file formateps limitPlot_combination_7TeV_1ifb_PUBfollowup_25Jun2010.eps r1 manage 12.4 K 2010-07-19 - 07:05 UnknownUser  
PNGpng limitPlot_combination_7TeV_1ifb_PUBfollowup_25Jun2010.png r1 manage 145.9 K 2010-07-19 - 07:06 UnknownUser  
Unknown file formateps limitPlot_combination_7TeV_1ifb_PUBfollowup_xsec_25Jun2010.eps r1 manage 12.8 K 2010-07-19 - 07:06 UnknownUser  
PNGpng limitPlot_combination_7TeV_1ifb_PUBfollowup_xsec_25Jun2010.png r1 manage 163.7 K 2010-07-19 - 07:08 UnknownUser  
Unknown file formateps pubnote_figure21.eps r1 manage 11.3 K 2010-07-19 - 20:46 UnknownUser  
PNGpng pubnote_figure21.png r1 manage 131.1 K 2010-07-19 - 20:47 UnknownUser  
Unknown file formateps taunu_limits.eps r1 manage 11.2 K 2010-07-19 - 07:23 UnknownUser  
PNGpng taunu_limits.png r1 manage 164.8 K 2010-07-19 - 07:23 UnknownUser  
Edit | Attach | Watch | Print version | History: r5 < r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r5 - 2011-01-26 - unknown
    • 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 & 2008-2021 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