SUSY, the Third Generation and the LHC

TL;DR

This paper explores a SUSY scenario with light third-generation squarks and heavy others, analyzing stability, constraints, and collider bounds, highlighting that current LHC data leaves much parameter space open for future exploration.

Contribution

It provides a detailed bottom-up analysis of SUSY with light stops and sbottoms, including stability, constraints, and phenomenology, emphasizing the motivation for R-parity violation and Dirac gauginos.

Findings

LHC 1/fb bounds are mild, leaving large parameter space open.

10/fb data can significantly constrain the scenario.

R-parity violation is well motivated in this context.

Abstract

We develop a bottom-up approach to studying SUSY with light stops and sbottoms, but with other squarks and sleptons heavy and beyond reach of the LHC. We discuss the range of squark, gaugino and Higgsino masses for which the electroweak scale is radiatively stable over the "little hierarchy" below ~ 10 TeV. We review and expand on indirect constraints on this scenario, in particular from flavor and CP tests. We emphasize that in this context, R-parity violation is very well motivated. The phenomenological differences between Majorana and Dirac gauginos are also discussed. Finally, we focus on the light subsystem of stops, sbottom and neutralino with R-parity, in order to probe the current collider bounds. We find that 1/fb LHC bounds are mild and large parts of the motivated parameter space remain open, while the 10/fb data can be much more decisive.