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\section{Conclusions and perspectives}
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\label{sec:conclusions}
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We have investigated the sensitivity of the CMS experiment
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to the detection and study of the $\proton\proton\to\W\Z\to 3 \ell\nu$ process.
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Signal and background samples were processed through full simulation,
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reconstruction and analysis chain of CMS.
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The present analysis expects a yield of 35 signal and 13 background events per 300 \invpb of the
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CMS integrated luminosity. Chances are, therefore, that first observation of
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\WZ\ pair production can be achieved by the end of the first CMS
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physics run. We estimate a statistical significance $S_L\simeq 7$ for 300~\invpb.
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In this note we develop methods for measuring the background yield
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from data. The largest challenge in the background suppression is proved to be the
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rejection of fake electrons originating from hadronic jets or photons. Even
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though less problematic, the rejection of true leptons from heavy quark
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decays is also an important key in reducing the background. Further work is
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planned in these directions together with e$\gamma$ and $\mu$ POGs.
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The relatively large signal yield and low level of background for the
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the $\WZ\to 3l$ mode makes it particularly attractive for the study of
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anomalous neutral triple gauge boson couplings, which should
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be done with as little as 500 \invpb. Larger data samples allows restrict or
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discover Technicolor and ED Higgs-less \WZ production phenomena.
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