The Least Supersymmetric Standard Model

TL;DR

This paper introduces the Least Supersymmetric Standard Model, a minimal variation that addresses the hierarchy problem with a unique supersymmetry breaking mechanism involving gauge and gravity mediation, leading to distinctive LHC phenomenology.

Contribution

It proposes a minimal supersymmetric model with a novel supersymmetry breaking and mediation scheme, reducing particle content and solving flavor issues.

Findings

First two generation sfermions acquire ~10 TeV masses

Supersymmetry breaking mediated by gauge and gravity at TeV scale

LHC phenomenology dominated by third generation squarks and sleptons

Abstract

We propose the minimal (Least) version of the Supersymmetric Standard Model which can solve the hierarchy problem in the same way as the so-called Minimal Supersymmetric Standard Model (MSSM) and presents solutions to some of its problems. Supersymmetry is broken in a secluded sector and mediated to the observable sector by messengers of a gauge group G under which the first two generations transform. The group G spontaneously breaks (almost) supersymmetrically at a scale at most a few orders of magnitude below the scale of gauge messengers M_*\sim 10^{15} GeV. By gauge mediation sfermions of the first two generations acquire supersymmetry breaking masses \hat m \sim 10 TeV. Supersymmetry breaking is also mediated by gravity which generates masses for all sfermions, Higgsinos and gauginos at the TeV scale and can provide appropriate values to the \mu and B_\mu parameters by D-term effective operators. If gravity mediation is Minimal Flavor Violating there is no supersymmetric flavor problem. In the presence of R-parity dark matter can be the lightest neutralino, as in the MSSM, and the LHC model phenomenology is characterized by the fact that only third generation squarks and sleptons are present.