Color-Octet Scalars of N=2 Supersymmetry at the LHC

TL;DR

This paper explores the production and decay of color-octet scalars (sgluons) in N=2 supersymmetry at the LHC, predicting large cross sections and distinctive multi-jet signatures for experimental detection.

Contribution

It introduces the properties and collider signatures of sgluons in N=2 supersymmetry, highlighting their production mechanisms and decay channels at the LHC, which were not previously detailed.

Findings

Large cross sections for sgluon pair production at the LHC.

Distinctive decay signatures involving multiple jets and gluinos.

Potential resonance signals from sgluon decays into gluons or top quark pairs.

Abstract

The color gauge hyper-multiplet in N=2 supersymmetry consists of the usual N=1 gauge vector/gaugino super-multiplet, joined with a novel gaugino/scalar super-multiplet. Large cross sections are predicted for the production of pairs of the color-octet scalars $\sigma$ [sgluons] at the LHC: $gg, q\bar{q} \to \sigma\sigma^{\ast}$. Single $\sigma$ production is possible at one-loop level, but the $g g\to \sigma$ amplitude vanishes in the limit of degenerate $L$ and $R$ squarks. When kinematically allowed, $\sigma$ decays predominantly into two gluinos, whose cascade decays give rise to a burst of eight or more jets together with four LSP's as signature for $\sigma$ pair events at the LHC. $\sigma$ can also decay into a squark-antisquark pair at tree level. At one-loop level $\sigma$ decays into gluons or a $t \bar t$ pair are predicted, generating exciting resonance signatures in the final states. The corresponding partial widths are very roughly comparable to that for three body final states mediated by one virtual squark at tree level.