Aspects of Z'-mediated Supersymmetry Breaking

TL;DR

This paper explores a class of supersymmetry models where breaking is mediated by a U(1)' gauge symmetry, leading to distinctive particle spectra and LHC signatures, with implications for neutrino masses and unification.

Contribution

It provides detailed construction and phenomenology of U(1)'-mediated SUSY breaking models, including spectrum predictions and collider signatures.

Findings

Heavy sfermions, Higgsinos, and exotics at 10-100 TeV

Light gauginos at 100-1000 GeV, with a ~140 GeV Higgs

Distinctive LHC signatures such as gluino decay patterns

Abstract

In a recent paper, we proposed the possibility that supersymmetry breaking is communicated dominantly via a U(1)' vector multiplet. We also required that the U(1)' plays a crucial role in solving the mu problem. We discuss here in detail both the construction and the phenomenology of one class of such models. The low energy spectrum generically contains heavy sfermions, Higgsinos and exotics ~10-100 TeV; an intermediate M_Z' ~ 3-30 TeV; light gauginos ~100-1000 GeV, of which the lightest can be wino-like; a light Higgs with a mass of ~140 GeV; and a singlino which can be very light. We present a set of possible consistent charge choices. Several benchmark models are used to demonstrate characteristic phenomenological features. Special attention is devoted to interesting LHC signatures such as gluino decay and the decay patterns of the electroweak-inos. Implications for neutrino masses, exotic decays, R-parity, gauge unification, and the gravitino mass are briefly discussed.