A search for new physics using thre+ e-lepton (trilepton) data
collected with the CDF II detector and corresponding to an integrated
luminosity of 976 pb-1 is presented. The standard model predicts a low
rate of trilepton events, which makes some supersymmetric processes,
such as chargino-neutralino production, measurable in this channel.
The mu mu + l signature is investigated, where l is an electron or a
muon, with the additional requirement of large missing transverse energy.
In this analysis, the lepton transverse momenta with respect to the beam
direction (p(t)) are as low as 5 GeV/c, a selection that improves the
sensitivity to particles which are light as well as to ones which result
in leptonically decaying tau leptons. At the same time, this low-p(t)
selection presents additional challenges due to the non-negligible
heavy-quark background at low lepton momenta. This background is measured
with an innovative technique using experimental data. Several dimuon
and trilepton control regions are investigated, and good agreement
between experimental results and standard-model predictions is observed.
In the signal region, we observe one thre+ e-muon event and expect 0.4
+/- 0.1 mu mu + l events from standard-model processes.
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Updated: Monday, 2009 March 23 13:07:44 CDT automatically from input from carol picciolo