Summary of the ATLAS experiment's sensitivity to supersymmetry after LHC Run 1 - interpreted in the phenomenological MSSM

TL;DR

This paper summarizes ATLAS experiment constraints on supersymmetry after LHC Run 1, interpreting results within the phenomenological MSSM and analyzing their implications for particle masses, dark matter, and electroweak fine-tuning.

Contribution

It provides a comprehensive interpretation of 22 ATLAS searches in the context of the 19-parameter phenomenological MSSM, including constraints on particle masses and dark matter.

Findings

Constraints on supersymmetric particle masses derived from ATLAS data.

Impact of supersymmetry searches on dark matter relic density and Higgs couplings.

Identification of low fine-tuning supersymmetry spectra surviving current constraints.

Abstract

A summary of the constraints from the ATLAS experiment on $R$-parity conserving supersymmetry is presented. Results from 22 separate ATLAS searches are considered, each based on analysis of up to 20.3 fb$^{-1}$ of proton-proton collision data at the centre-of-mass energy of $\sqrt{s}$ = 7 and 8 TeV at the Large Hadron Collider. The results are interpreted in the context of the 19-parameter phenomenological minimal supersymmetric standard model, in which the lightest supersymmetric particle is a neutralino, taking into account constraints from previous precision electroweak and flavour measurements as well as from dark matter related measurements. The results are presented in terms of constraints on supersymmetric particle masses and are compared to limits from simplified models. The impact of ATLAS searches on parameters such as the dark matter relic density, the couplings of the observed Higgs boson, and the degree of electroweak fine-tuning is also shown. Spectra for surviving supersymmetry model points with low fine-tunings are presented.