Multi-channel assault on natural supersymmetry at the high luminosity LHC

TL;DR

This paper assesses the high-luminosity LHC's potential to detect natural supersymmetry, focusing on light higgsinos and heavy gluinos, and concludes that 3000 fb^{-1} could confirm or exclude natural SUSY with minimal fine-tuning.

Contribution

It provides projections for the LHC14's sensitivity to natural supersymmetry through various decay channels, highlighting the potential to discover or rule out natural SUSY at high luminosity.

Findings

3000 fb^{-1}} is sufficient to probe naturalness with 3% fine-tuning

Gluino cascade decays and same-sign diboson production are promising detection channels

Natural SUSY could be confirmed or excluded at 5-sigma level

Abstract

Recent clarifications of naturalness in supersymmetry robustly require the presence of four light higgsinos with mass ~100-300 GeV while gluinos and (top)-squarks may lie in the multi-TeV range, possibly out of LHC reach. We project the high luminosity (300-3000 fb^{-1}) reach of LHC14 via gluino cascade decays and via same-sign diboson production. We compare these to the reach for neutralino pair production \tz_1\tz_2 followed by \tz_2\to\tz_1\ell^+\ell^- decay to soft dileptons which recoil against a hard jet. It appears that 3000 fb^{-1} is just about sufficient integrated luminosity to probe naturalness with up to 3\% fine-tuning at the 5-sigma level, thus either discovering natural supersymmetry or else ruling it out.