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\section{Limits on New Physics} |
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\label{sec:limit} |
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We proceed to set upper limits on the non-SM contributions to the 2 signal regions. For both regions, |
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we find reasonable agreement between the observed yields and the predictions from MC and from the 2 |
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We set an upper limit on the signal yield extracted by the fit to the dilepton mass |
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distribution, assuming the LM1 shape. The 95\% confidence level (CL) upper limit (UL) |
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is extracted using a profile likelihood technique, giving an UL of 14.3 events, including |
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uncertainties in the background yield and shape, resolution model and $Z$ yield. |
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In the limit setting we also include the uncertainties from trigger efficiency, |
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lepton selection efficiency, hadronic energy scale and integrated luminosity on the signal efficiency. |
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The expected LM1 yield is 23 $\pm$ 3 events. |
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We set upper limits on the non-SM contributions to the high \MET\ and high \Ht\ signal regions. |
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For both regions, we find reasonable agreement between the observed yields and the predictions from MC and from the 2 |
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data-driven methods. We choose here to extract the upper limits using the MC prediction for the |
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background estimate. The 95\% CL upper limit is extracted using a Bayesian technique~\cite{ref:cl95cms}, |
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using a log-normal model of nuissance parameter integration. The results are summarized in |
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Table~\ref{tab:results}. Based on these results, we exclude LM1 but not LM3. |
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with a log-normal model of nuissance parameter integration assuming 0 signal . The results are summarized in |
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Table~\ref{tab:results}. |
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\begin{table}[hbt] |
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\begin{center} |
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\caption{\label{tab:results} |
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Summary of the observed and predicted yields in the 2 signal regions. MC errors are statistical only. |
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Summary of the observed and predicted yields in the 2 signal regions. The uncertainty in the MC prediction is statistical only. |
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The systematic uncertainties on the ABCD', \ptll, and OF subtraction predictions are discussed in the text. The non-SM yield UL is a |
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Bayesian 95\% confidence level upper limit. The LM1 and LM3 yields include uncertainties from trigger efficiency, |
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lepton selection efficiency, hadronic energy scale and integrated luminosity. |
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} |
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\begin{tabular}{l|c|c|c} |
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\begin{tabular}{|l|c|c|c} |
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\hline |
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& high \met\ signal region & high \Ht\ signal region \\ |
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\hline |
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ABCD' prediction & 1.2 $\pm$ 0.4 (stat) $\pm$ 0.5 (syst) & 0.0 $\pm$ 0.6 (stat) $\pm$ 0.3 (syst) \\ |
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\ptll\ prediction & 5.4 $\pm$ 3.8 (stat) $\pm$ 2.2 (syst) & 1.7 $\pm$ 1.7 (stat) $\pm$ 0.6 (syst) \\ |
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non-SM yield UL & 5.2 & 4.1 \\ |
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LM1 yield & 17 $\pm$ 2.4 & 14 $\pm$ 2.7 \\ |
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LM3 yield & 4.3 $\pm$ 0.8 & 4.3 $\pm$ 0.9 \\ |
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LM1 yield & 17 $\pm$ 2.5 & 14 $\pm$ 2.9 \\ |
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LM3 yield & 6.4 $\pm$ 1.2 & 6.7 $\pm$ 1.5 \\ |
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\hline |
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OF subtraction ($\Delta$) & 1.3 $\pm$ 1.9 (stat) $\pm$ 0.1 (syst) & 0.1 $\pm$ 1.5 (stat) $\pm$ 0.0 (syst) \\ |
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\hline |
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\end{tabular} |
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\end{center} |
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\end{table} |
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