Prospects for Beyond the Standard Model Physics at the Start of the LHC13 era

TL;DR

This paper discusses the implications of the Higgs discovery and lack of new particles on naturalness in SUSY, proposing that light higgsinos and axions are key to understanding beyond the Standard Model physics at current and future colliders.

Contribution

It re-evaluates naturalness in SUSY, suggesting light higgsinos and axions are natural, and outlines experimental signatures and future tests for BSM physics.

Findings

Light higgsinos with mass 100-300 GeV are natural in SUSY.

Special signatures like dilepton edges and same-sign dibosons could be observed at LHC13.

Detection of higgsino-like WIMPs and DFSZ axions is expected in future experiments.

Abstract

The discovery of the Higgs boson along with the vigorous confirmation of the SM coupled with non-appearance of new (SUSY) particles has led to an apparent naturalness crisis. We argue the crisis stems from overestimates of finetuning. A proper evaluation of naturalness in SUSY leads to light higgsinos with mass mu~ 100-300 GeV while other sparticles may inhabit the multi-TeV range at little cost to naturalness. Special signatures like dilepton mass edges in gluino pair events and same-sign dibosons from wino pairs might occur at LHC13. An ILC with \sqrt{s}>2 mu would make the definitive test of naturalness in the MSSM. Naturalness in the QCD sector requires the axion leading to mixed axion-WIMP dark matter. There appears a deep connection between electroweak naturalness and a DFSZ-like SUSY axion sector which gives rise to the mu~ f_a^2/M_P parameter. Ultimately we expect detection of a higgsino-like WIMP at ton-scale DM detectors and detection of a DFSZ-type axion at ADMX.