Constraint from recent ATLAS results on non-universal sfermion mass models and naturalness

TL;DR

Recent ATLAS SUSY searches impose weaker constraints on non-universal sfermion mass models than on constrained MSSM, allowing for naturalness and highlighting the need for dedicated analyses to explore this scenario further.

Contribution

This paper demonstrates that non-universal sfermion mass models are less constrained by current ATLAS searches, supporting their viability for natural SUSY.

Findings

Constraints from ATLAS are weaker for this scenario than for CMSSM.

Naturalness is compatible with current direct SUSY search results.

Dedicated analyses are necessary to fully explore this model.

Abstract

We investigate the impact of recent direct supersymmetry (SUSY) searches on a non-universal sfermion mass scenario focusing on naturalness. One of the advantages of this scenario is that the non-universality between third generation and first two generation sfermion masses can relax the tension between naturalness and constraints from flavour and CP violating observables. In the parameter region, where various phenomenological constraints are satisfied, the constraints to this scenario from ATLAS 165pb-1 "0-lepton" search and 35pb-1 "b-jet" search are much weaker than those to the constrained minimal SUSY standard model, because of differences in the main SUSY production processes and the main decay chains. Naturalness can be easily achieved in this scenario in accord with the current direct SUSY searches. An additional dedicated analysis may be needed to discover/exclude this scenario.