Dirac Gauginos in Supersymmetry -- Suppressed Jets + MET Signals: A Snowmass Whitepaper

TL;DR

This whitepaper explores how Dirac gluinos modify squark production in supersymmetry, leading to suppressed signals and weaker experimental bounds, with implications for future collider searches at 14 and 33 TeV.

Contribution

It provides updated calculations of squark production cross sections with Dirac gluinos and compares them to Majorana cases, highlighting the impact on experimental bounds and collider phenomenology.

Findings

First generation squark production is highly suppressed with Dirac gluinos.

Bounds on squark masses are weaker than in MSSM, especially for heavy LSP.

Associated squark+gluino production is very small at 14 TeV but relevant at higher energies.

Abstract

We consider the modifications to squark production in the presence of a naturally heavier Dirac gluino. First generation squark production is highly suppressed, providing an interesting but challenging signal find or rule out. No dedicated searches for supersymmetry with a Dirac gluino have been performed, however a reinterpretation of a "decoupled gluino" simplified model suggests the bounds on a common first and second generation squark mass is much smaller than in the MSSM: $\lsim 850$ GeV for a massless LSP, and no bound for an LSP heavier than about 300 GeV. We compare and contrast the squark production cross sections between a model with a Dirac gluino and one with a Majorana gluino, updating earlier results in the literature to a $pp$ collider operating at $\sqrt{s} = 14$ and 33 TeV. Associated production of squark+gluino is likely very small at $\sqrt{s} = 14$ TeV, while is a challenging but important signal at even higher energy $pp$ colliders. Several other salient implications of Dirac gauginos are mentioned, with some thought-provoking discussion as it regards the importance of the various experiments planned or proposed.