[$\PSGt_{\mathrm{L}}$]{}decays. Two simplified models are studied for direct pair production. One model involves production of only [$\PSGt_{\mathrm{L}}$]{}pairs and the other is for the degenerate case in which both [$\PSGt_{\mathrm{L}}$]{}and [$\PSGt_{\mathrm{R}}$]{}pairs are produced. No mixing is introduced between left- and right-handed states. We study models with masses ranging from 90 to 200. The LEP limits [@Heister:2001nk; @Abdallah:2003xe; @Achard:2003ge; @Abbiendi:2003ji] place strong constraints on the allowed values of the mass below this range, while the search sensitivity for masses above this range is low as a result of the decrease in production cross section with increased mass. We also consider different assumptions for the mass, namely 1, 10, and 20. The search sensitivity decreases when the mass difference between the and becomes small, since the visible decay products in such cases have lower momentum, resulting in a loss of experimental acceptance for such signals.

![\[fig:diagram\] Diagram for direct pair production, followed by decay of each to a lepton and a .](Figure_001.pdf){width="50.00000%"}

The CMS detector {#sec:detector}
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=800 The central feature of the CMS apparatus is a superconducting solenoid of 6 internal diameter, providing a magnetic field of 3.8. A silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter (ECAL), and 