Mini-review: Expectations for supersymmetry from the string landscape

TL;DR

This mini-review discusses how string theory landscape considerations influence supersymmetry phenomenology, predicting a Higgs mass around 125 GeV, heavy sparticles beyond LHC reach, and a mixed dark matter composition.

Contribution

It provides a synthesis of how string landscape ideas constrain supersymmetry models and their experimental signatures, emphasizing the anthropic window for the weak scale.

Findings

Predicted Higgs mass around 125 GeV.

Sparticles generally beyond current LHC bounds.

Dark matter likely an axion/higgsino mixture.

Abstract

In this mini-review, we summarize a variety of findings pertaining to consequences of the landscape of string theory for supersymmetry (SUSY) phenomenology. The idea is to adopt the MSSM as the most parsimonious 4-d low energy EFT after string compactification but where the scale of SUSY breaking is as yet undetermined. A power-law landscape draw to large soft terms is tempered by the requirement that the derived value of the weak scale lie within the anthropic window of Agrawal {\it et al.} (ABDS). Such a set-up predicts a light Higgs mass m_h~ 125 GeV with sparticles generally beyond LHC bounds. We discuss consequences for LHC searches: light higgsinos, highly mixed TeV-scale top squarks, same-sign diboson events and m_{\tg}~ 2-5 TeV. We expect dark matter to consist of an axion/higgsino-like WIMP admixture.