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| CMS-PAS-HIG-15-003 | ||
| First results on Higgs to WW at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| June 2016 | ||
| Abstract: The first results on the standard model Higgs boson decaying to a W-boson pair at $ \sqrt{s} = $ 13 TeV at the LHC are reported. The event sample corresponds to an integrated luminosity of 2.3 $\pm$ 0.1 fb$^{-1}$, collected by the CMS detector in 2015. The $\mathrm{W}^+\mathrm{W}^-$ candidates are selected in events with an oppositely charged $\mathrm{e}\mu$ pair and large missing transverse momentum in association with up to one jet. The observed (expected) significance for the SM Higgs boson with a mass of 125 GeV is 0.7$\sigma$ (2.0$\sigma$), corresponding to an observed cross section times branching ratio of 0.3 $\pm$ 0.5 times the standard model prediction. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1-a:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d), for the main backgrounds (stacked histograms), and for the expected SM Higgs boson signal with $m_{\mathrm{H}} =$ 125 GeV (superimposed and stacked red histogram) after all selection criteria. The last bin of the histograms includes overflows. Scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
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Figure 1-b:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d), for the main backgrounds (stacked histograms), and for the expected SM Higgs boson signal with $m_{\mathrm{H}} =$ 125 GeV (superimposed and stacked red histogram) after all selection criteria. The last bin of the histograms includes overflows. Scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
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Figure 1-c:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d), for the main backgrounds (stacked histograms), and for the expected SM Higgs boson signal with $m_{\mathrm{H}} =$ 125 GeV (superimposed and stacked red histogram) after all selection criteria. The last bin of the histograms includes overflows. Scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
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Figure 1-d:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d), for the main backgrounds (stacked histograms), and for the expected SM Higgs boson signal with $m_{\mathrm{H}} =$ 125 GeV (superimposed and stacked red histogram) after all selection criteria. The last bin of the histograms includes overflows. Scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
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Figure 2-a:
Distributions of ${m_{\ell \ell }}$ for events with 0 jet (a) and 1 jet (b) in the same-charge dilepton control region. The global normalisation factor of 0.8 for the jet induced background derived in this control region is applied. The last bin of the histograms includes overflows. |
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Figure 2-b:
Distributions of ${m_{\ell \ell }}$ for events with 0 jet (a) and 1 jet (b) in the same-charge dilepton control region. The global normalisation factor of 0.8 for the jet induced background derived in this control region is applied. The last bin of the histograms includes overflows. |
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Figure 3-a:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d) in top enriched phase space. Scale factors estimated from data are applied. |
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Figure 3-b:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d) in top enriched phase space. Scale factors estimated from data are applied. |
png |
Figure 3-c:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d) in top enriched phase space. Scale factors estimated from data are applied. |
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Figure 3-d:
Distributions of ${m_{\ell \ell }}$ (a,c) and ${m_\mathrm {T}^\mathrm {H}}$ (b,d) for events with 0 jet (a,b) and 1 jet (c,d) in top enriched phase space. Scale factors estimated from data are applied. |
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Figure 4-a:
Distributions of ${m_{\ell \ell }}$ for events with 0 jet (a) and 1 jet (b) in the DY$\rightarrow \tau \tau $ ${m_\mathrm {T}^\mathrm {H}} < $ 60 GeV and 30 GeV $< {m_{\ell \ell }} <$ 80 GeV control region. Scale factors estimated from the normalization difference to the data are applied. |
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Figure 4-b:
Distributions of ${m_{\ell \ell }}$ for events with 0 jet (a) and 1 jet (b) in the DY$\rightarrow \tau \tau $ ${m_\mathrm {T}^\mathrm {H}} < $ 60 GeV and 30 GeV $< {m_{\ell \ell }} <$ 80 GeV control region. Scale factors estimated from the normalization difference to the data are applied. |
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Figure 5-a:
Bi-dimensional distributions of the ${m_{\ell \ell }}$ and ${m_\mathrm {T}^\mathrm {H}}$ templates in the 0-jet (a,b) and 1-jet (c,d) and $\mu $e (a,c) and e$\mu $ (b,d) categories after the WW level selection. The bi-dimensional templates ranges are 10 $ < {m_{\ell \ell }} < $ 110 GeV and 0 $ < {m_\mathrm {T}^\mathrm {H}} < $ 200 GeV with 5 bins in ${m_{\ell \ell }}$ and 10 bins in ${m_\mathrm {T}^\mathrm {H}} $. The distributions are unrolled to one dimensional histograms such that that identical values of ${m_\mathrm {T}^\mathrm {H}}$ are in adjacent bins. The background and signal contributions are normalized according to their pre-fit values except that scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
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Figure 5-b:
Bi-dimensional distributions of the ${m_{\ell \ell }}$ and ${m_\mathrm {T}^\mathrm {H}}$ templates in the 0-jet (a,b) and 1-jet (c,d) and $\mu $e (a,c) and e$\mu $ (b,d) categories after the WW level selection. The bi-dimensional templates ranges are 10 $ < {m_{\ell \ell }} < $ 110 GeV and 0 $ < {m_\mathrm {T}^\mathrm {H}} < $ 200 GeV with 5 bins in ${m_{\ell \ell }}$ and 10 bins in ${m_\mathrm {T}^\mathrm {H}} $. The distributions are unrolled to one dimensional histograms such that that identical values of ${m_\mathrm {T}^\mathrm {H}}$ are in adjacent bins. The background and signal contributions are normalized according to their pre-fit values except that scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
png |
Figure 5-c:
Bi-dimensional distributions of the ${m_{\ell \ell }}$ and ${m_\mathrm {T}^\mathrm {H}}$ templates in the 0-jet (a,b) and 1-jet (c,d) and $\mu $e (a,c) and e$\mu $ (b,d) categories after the WW level selection. The bi-dimensional templates ranges are 10 $ < {m_{\ell \ell }} < $ 110 GeV and 0 $ < {m_\mathrm {T}^\mathrm {H}} < $ 200 GeV with 5 bins in ${m_{\ell \ell }}$ and 10 bins in ${m_\mathrm {T}^\mathrm {H}} $. The distributions are unrolled to one dimensional histograms such that that identical values of ${m_\mathrm {T}^\mathrm {H}}$ are in adjacent bins. The background and signal contributions are normalized according to their pre-fit values except that scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
png |
Figure 5-d:
Bi-dimensional distributions of the ${m_{\ell \ell }}$ and ${m_\mathrm {T}^\mathrm {H}}$ templates in the 0-jet (a,b) and 1-jet (c,d) and $\mu $e (a,c) and e$\mu $ (b,d) categories after the WW level selection. The bi-dimensional templates ranges are 10 $ < {m_{\ell \ell }} < $ 110 GeV and 0 $ < {m_\mathrm {T}^\mathrm {H}} < $ 200 GeV with 5 bins in ${m_{\ell \ell }}$ and 10 bins in ${m_\mathrm {T}^\mathrm {H}} $. The distributions are unrolled to one dimensional histograms such that that identical values of ${m_\mathrm {T}^\mathrm {H}}$ are in adjacent bins. The background and signal contributions are normalized according to their pre-fit values except that scale factors estimated from data are applied to the jet induced, the Drell-Yan, and top backgrounds. |
| Summary |
| A measurement of the SM Higgs boson decaying to WW in pp collisions at $\sqrt{s} =$ 13 TeV is performed by the CMS experiment using a data sample corresponding to an integrated luminosity of 2.3 fb$^{-1}$. The $\mathrm{W^+W^-}$ candidates are selected in events with an oppositely charged $\mathrm{e}\mu$ pair and large missing transverse momentum in association with up to one additional jet. The observed (expected) significance for a SM Higgs boson with a mass of 125 GeV is 0.7$\sigma$ (2.0$\sigma$), corresponding to an observed cross section times branching ratio of 0.3 $\pm$ 0.5 times the standard model prediction. |
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