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The discovery of the stop - the Supersymmetric partner of the top quark - isa key goal of the physics program enabled by the Large Hadron Collider.Although much of the accessible parameter space has already been probed, allcurrent searches assume the top mass is known. This is relevant for the"stealth stop" regime, which is characterized by decay kinematics that forcethe final state top quark off its mass shell; such decays would contaminate thetop mass measurements. We investigate the resulting bias imparted to thetemplate method based ATLAS approach. A careful recasting of these resultsshows that effect can be as large as 2.0 GeV, comparable to the current quoteduncertainty on the top mass. Thus, a robust exploration of the stealth stopsplinter requires the simultaneous consideration of the impact on the top mass.Additionally, we explore the robustness of the template technique, and pointout a simple strategy for improving the methodology implemented for thesemi-leptonic channel.

On the ATLAS Top Mass Measurements and the Potential for Stealth Stop Contamination