Searches for the supersymmetric partners of top and bottom quarks using data up to 340 pb{sup -1} taken at the Tevatron p{bar p} collider are described. We report on searches for scalar top quarks {tilde t} in the decays {tilde t} {yields} c{tilde {chi}}{sub 1}{sup 0} and {tilde t} {yields} bl{tilde v} and for scalar bottom quarks in the decay {tilde b} {yields} b{tilde {chi}}{sub 1}{sup 0}. No evidence for a signal has been found, but improved exclusion regions have been derived in the framework of a generic minimal supersymmetric extension of the standard model.

This document reviews recent results on the search for scalar top and scalar bottom quarks in p{bar p} collisions at (square root)s = 1.96 TeV. The analyses presented are based on data samples with integrated luminosities from 1.0 to 1.9 fb−1 recorded at the Tevatron with the D0 and CDF detectors.

We searched for scalar bottom quarks in 156 pb−1 of {bar p}p collisions at √s = 1.96 TeV recorded by the CDF II experiment at the Tevatron. Scalar bottom quarks can be produced from gluino decays in R-parity conserving models of supersymmetry when the mass of the gluino exceeds that of the scalar bottom quark. Then, a scalar bottom quark can decay into a bottom quark and a neutralino. To search for this scenario, we investigated events with large missing transverse energy and at least three jets, two or more of which were identified as containing a secondary vertex from the hadronization of b quarks. We found four candidate events, where 2.6 ± 0.7 are expected from standard model processes, and placed 95% confidence level lower limits on gluino and scalar bottom quark masses of up to 280 and 240 GeV/c2, respectively.

We present here recent searches at the Tevatron for new phenomena. The superlight gravitino, scalar top and scalar bottom quarks searches are described in the framework of the supersymmetric models. We also discuss the new Tevatron limits on the second and third generations leptoquark masses.

We searched for scalar bottom quarks in 156 pb−1 of {bar p}p collisions at √s = 1.96 TeV recorded by the CDF II experiment at the Tevatron. Scalar bottom quarks can be produced from gluino decays in R-parity conserving models of supersymmetry when the mass of the gluino exceeds that of the scalar bottom quark. Then, a scalar bottom quark can decay into a bottom quark and a neutralino. To search for this scenario, we investigated events with large missing transverse energy and at least three jets, two or more of which were identified as containing a secondary vertex from the hadronization of b quarks. We found four candidate events, where 2.6 ± 0.7 are expected from standard model processes, and placed 95% confidence level lower limits on gluino and scalar bottom quark masses of up to 280 and 240 GeV/c2 , respectively.

A search for direct production of scalar bottom quarks ({bar b}) is performed with 310 pb−1 of data collected by the D0 experiment in p{bar p} collisions at √s = 1.96 TeV at the Fermilab Tevatron Collider. The topology analyzed consists of two b jets and an imbalance in transverse momentum due to undetected neutralinos ({tilde {chi}}1°), with {tilde {chi}}1° assumed to be the lightest supersymmetric particle. They find the data consistent with standard model expectations, and set a 95% C.L. exclusion domain in the (m{sub {tilde b}}, m{sub {tilde {chi}}}) mass plane, improving significantly upon the results from Run I of the Tevatron.