Dirac Gluinos in the Pyramid Scheme

TL;DR

This paper revises the Pyramid Scheme model by identifying overlooked terms that generate a Dirac gluino mass, allowing for heavier gluinos compatible with LHC data and potentially reducing fine-tuning issues.

Contribution

It uncovers additional terms in the effective Lagrangian leading to a significant Dirac gluino mass, improving the model's phenomenological viability.

Findings

Dirac gluino mass can be much larger than previously estimated.

Heavier gluinos reduce tension with LHC constraints.

Model corrections to the Higgs potential may lessen fine-tuning.

Abstract

I point out several terms in the low energy effective Lagrangian of the Pyramid Scheme, which were missed in a previous analysis of the phenomenological consequences of the model. They lead to a Dirac contribution to the gluino mass, much larger than the one loop Majorana mass. The gluino can thus be much heavier than in previous estimates, without introducing corresponding large loop corrections to squark masses. As pointed out by a number of authors, this ameliorates the tension between the predictions of the model, and LHC data. I also point out that the model has corrections to the Higgs potential, both at the tree and loop levels, which may ameliorate fine tuning.