Towards model-independent exclusion of light Stops

TL;DR

This paper evaluates the sensitivity of experimental searches to Light Stop scenarios, demonstrating exclusions of certain mass regions and emphasizing the need for more comprehensive exploration of the parameter space.

Contribution

It extends experimental search coverage to exclude Light Stops below the top mass assuming a single decay channel and analyzes the impact of multiple decay channels on search sensitivity.

Findings

Excluded Light Stop mass region below top mass assuming a single decay channel

Electroweak baryogenesis in MSSM is excluded by these results

Search sensitivity is reduced in scenarios with multiple decay channels

Abstract

Understanding the extent to which experimental searches are sensitive to Light Stops (LST) scenarios is essential to resolve questions about naturalness, electroweak baryogenesis and Dark Matter. In this paper we characterize the reach on LST scenarios in two ways. We extend experimental searches to cover specific gaps in the LST parameter space, showing for the first time that assuming a single decay channel one can exclude the region of $m_{\tilde{t}}<m_{top}$, which in its turn excludes electroweak baryogenesis in MSSM. Also, we explore the extent to which searches are weakened in a more generic scenario when more than one decay channel takes place, even after their combination. This study highlights the need for a more comprehensive exploration of the LST parameter space.