Search for Supersymmetry in H to $\gamma\gamma$ final states with the razor variables at $\sqrt{s}=8$ CMS.TeV

Abstract

A search for Higgs bosons in decays of supersymmetric particles is presented, using the LHC proton-proton collision data collected by the CMS experiment at a center-of-mass energy $\sqrt{s}$ = 8 CMS.TeV and corresponding to an integrated luminosity of 19.8 fb$^{-1}$. Higgs bosons are reconstructed in diphoton final states in association with at least one jet. The razor variables $M_{R}$ and $R^{2}$ are used to categorize events into different regions to improve signal-to-background discrimination. The results are interpreted as constraints on a set of simplified SUSY benchmark models.

Figures and tables

Figure Abbreviated Caption
The fits to the $m_{\gamma\gamma}$ distribution in the CMS.HighPt category integrated over the entire ($M_{R}$,$R^{2}$) plane. The fits are shown with their $\pm1\sigma$ (yellow) and $\pm2\sigma$ (green) uncertainty bands.
The fits to the $m_{\gamma\gamma}$ distribution in the H$\rightarrow$bb category integrated over the entire ($M_{R}$,$R^{2}$) plane. The fits are shown with their $\pm1\sigma$ (yellow) and $\pm2\sigma$ (green) uncertainty bands.
The fits to the $m_{\gamma\gamma}$ distribution in the Z$\rightarrow$bb category integrated over the entire ($M_{R}$,$R^{2}$) plane. The fits are shown with their $\pm1\sigma$ (yellow) and $\pm2\sigma$ (green) uncertainty bands.
The fits to the $m_{\gamma\gamma}$ distribution in the HighRes category integrated over the entire ($M_{R}$,$R^{2}$) plane. The fits are shown with their $\pm1\sigma$ (yellow) and $\pm2\sigma$ (green) uncertainty bands.
The fits to the $m_{\gamma\gamma}$ distribution in the LowRes category integrated over the entire ($M_{R}$,$R^{2}$) plane. The fits are shown with their $\pm1\sigma$ (yellow) and $\pm2\sigma$ (green) uncertainty bands.
Number of Events observed in the signal region compared to expected background in the CMS.HighPt category
Number of Events observed in the signal region compared to expected background in the Hbb category
Number of Events observed in the signal region compared to expected background in the Zbb category
Number of Events observed in the signal region compared to expected background in the HighRes category
Number of Events observed in the signal region compared to expected background in the LowRes category
The observed cross-section upper limit for the $\chi_1\chi_1\to HH\tilde{G}\tilde{G}$ SMS as a function of the mass of the neutralino (set equal to the mass of the chargino in the left plot) with the mass of the LSP set $m_{LSP}=1$ CMS.GeV. The expected limit, is shown as a dashed line, while the observed limit from the observed data is shown as the solid line. The expected theoretical cross section is shown as the dotted line with the theory uncertainty in blue.
The ratio of the observed cross-section upper limit for the $\chi_1\chi_1\to HH\tilde{G}\tilde{G}$ SMS to the theoretic cross section is shown as a function of the mass of the neutralino (set equal to the mass of the chargino in the left plot) with the mass of the LSP set $m_{LSP}=1$ CMS.GeV. The expected limit, is shown as a dashed line, while the observed limit from the observed data is shown as the solid line.
The observed cross-section upper limit for the $\chi_2\chi_1^\pm\to HW^\pm \chi_0\chi_0$ SMS as a function of the mass of the neutralino (set equal to the mass of the chargino in the left plot) with the mass of the LSP set $m_{LSP}=1$ CMS.GeV. The expected limit, is shown as a dashed line, while the observed limit from the observed data is shown as the solid line. The expected theoretical cross section is shown as the dotted line with the theory uncertainty in blue.
The ratio of the observed cross-section upper limit for the $\chi_2\chi_1^\pm\to HW^\pm \chi_0\chi_0$ SMS to the theoretic cross section is shown as a function of the mass of the neutralino (set equal to the mass of the chargino in the left plot) with the mass of the LSP set $m_{LSP}=1$ CMS.GeV. The expected limit, is shown as a dashed line, while the observed limit from the observed data is shown as the solid line.

The SM Higgs production mechanisms considered as background to this analysis. The cross-section values correspond to 8 CMS.TeV pp collisions with $m_{H}$ = 125 CMS.GeV
Transfer factors derived from the fits to the $m_{\gamma\gamma}$ upper and lower sideband. The quoted uncertainties account for the statistical uncertainty in the fit and the choice of the functional form
Event yields for the QCD combinatorial, the SM Higgs, and the total background in each event category for the baseline selection with $M_{R}$ > 150 CMS.GeV, are shown along with the event yields observed in data
Event yields and efficiency $\epsilon$ for the two signal benchmark models and for the baseline selection with $M_{R}$ > 150 CMS.GeV
A summary of the systematic uncertainties are shown.

The flowchart describing the procedure for defining the event categories.

The local significance is shown for each bin considered in the analysis. The bins are grouped according to the event categories used.
The diphoton mass distribution is shown for the bin exhibiting the most significant excess. The bin is defined by $1400$ GeV $< M_{R}<400$ GeV and $R^{2}>0.05$. The region between the black lines is the defined Higgs signal region. The green shaded region indicates region around the Higgs mass ± ∼1 $\sigma_{\mathrm{eff}}$.
The distribution of events in the full $M_{R}$ and $R^{2}$ plane is shown for the HighPt category. Each black dot represents one event in the Higgs signal region. The color distribution shows the background prediction obtained using the sideband sample scaled by the corresponding transfer factor. The lines denote the boundaries of the bins used in the search.
The distribution of events in the full $M_{R}$ and $R^{2}$ plane is shown for the Hbb category. Each black dot represents one event in the Higgs signal region. The color distribution shows the background prediction obtained using the sideband sample scaled by the corresponding transfer factor. The lines denote the boundaries of the bins used in the search.
The distribution of events in the full $M_{R}$ and $R^{2}$ plane is shown for the Zbb category. Each black dot represents one event in the Higgs signal region. The color distribution shows the background prediction obtained using the sideband sample scaled by the corresponding transfer factor. The lines denote the boundaries of the bins used in the search.
The distribution of events in the full $M_{R}$ and $R^{2}$ plane is shown for the HighRes category. Each black dot represents one event in the Higgs signal region. The color distribution shows the background prediction obtained using the sideband sample scaled by the corresponding transfer factor. The lines denote the boundaries of the bins used in the search.
The distribution of events in the full $M_{R}$ and $R^{2}$ plane is shown for the LowRes category. Each black dot represents one event in the Higgs signal region. The color distribution shows the background prediction obtained using the sideband sample scaled by the corresponding transfer factor. The lines denote the boundaries of the bins used in the search.
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PDFpdf FlowChart_PaperFinal.pdf r1 manage 225.6 K 2015-08-25 - 00:15 SiXie  
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