TL;DR
This paper investigates how a nearly degenerate light supersymmetric top quark partner (stop) could bias top quark mass measurements and evade detection, affecting the interpretation of top property measurements.
Contribution
It provides an estimate of the impact a light stop could have on top mass measurements, highlighting potential biases and detection challenges.
Findings
Light stops can induce biases of up to a few GeV in top mass measurements.
Such biases can conceal the effects of stops in cross-section measurements.
The study uses truth-level samples and simplified assumptions for the analysis.
Abstract
A light supersymmetric top quark partner (stop) with a mass nearly degenerate with that of the Standard Model (SM) top quark can evade direct searches. The precise measurement of SM top properties such as the cross-section has been suggested to give a handle for this `stealth stop' scenario. We present an estimate of the potential impact a light stop may have on top quark mass measurements. The results indicate that certain light stop models may induce a bias of up to a few GeV, and that this effect can hide the shift in, and hence sensitivity from, cross-section measurements. The studies make some simplifying assumptions for the top quark measurement technique, and are based on truth-level samples.
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