Search for Pair Production of Supersymmetric Top Quarks Mimicking Standard Model Top Event Signatures at CDF

TL;DR

This paper reports a search for supersymmetric top quark partners (stops) at CDF, setting mass limits and analyzing decay signatures to distinguish potential signals from Standard Model backgrounds.

Contribution

First search at CDF for stop quark decaying to b-quark and chargino, with mass reconstruction and upper limit setting on supersymmetric particle masses.

Findings

Set 95% confidence level upper limits on stop, chargino, and neutralino masses.

Reconstructed candidate events to estimate stop mass.

Provided constraints on supersymmetric models based on observed data.

Abstract

We present results of the search for the super-symmetric partner of the top quark, the stop quark, decaying to a b-quark and chargino with the subsequent chargino decay into a neutralino, lepton and neutrino. Using the data sample corresponding to 2.7 inv fb of integrated luminosity, collected with the CDF Detector of the Tevatron collider, we reconstruct the stop mass of candidate events and set 95% C. L. upper limits on masses of the stop quark, chargino and neutralino and the branching ratio of chargino to neutralino+lepton+neutrino.