CDF Logo Search for Direct Pair Production of Scalar Top Quark
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We report on the search for direct pair production of scalar top quarks using 163 pb-1 of proton-antiproton collision data recorded by the CDF experiment during Run 2 of the Tevatron. The scalar top quarks are sought via their decay into a charm quark and a neutralino, which is the lightest supersymmetric particle. The event signature is missing transverse energy and several high-Et jets. In the scalar top quark signal region, 11 events are observed with 8.3+2.3-1.7 expected from background. Thus no evidence for scalar top quark is observed, and 95% CL. limits are set on the cross section times squared branching ratio as function of the scalar top quark mass, for several neutralino masses. We assume 100% branching ratio for scalar top quark decays into charm quark and neutralino.


Blessed Plots and Tables:

Before tagging the jets for heavy flavor
Missing ET of events selected with all selection cuts except the heavy flavor tagging (with Jet Probability algorithm). EPS or GIF
The Jet Probability distribution of the un-tagged events. The Jet Probability value in this distribution is the smaller of the Jet Probability values from the first and second leading taggable jets. EPS or GIF
After tagging the jets for heavy flavor
Missing ET of events selected with all selection cuts, including tagging the leading jets for heavy flavor (with Jet Probability algorithm). EPS or GIF

Cross section limit curves (at 95% CL)
For Mass(Neutralino)=40 GeV EPS or GIF
For Mass(Neutralino)=50 GeV EPS or GIF
For Mass(Neutralino)=55 GeV EPS or GIF

Page page: http://www-cdf.fnal.gov/internal/physics/exotic/physics/r2a/00000000.template/index.html was last updated October 6th, 2004 by Stephan Lammel.
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