Abstract
We compare the prospects for observing theories with Majorana or Dirac gauginos at a future 100 TeV proton-proton collider. Calculating the expected discovery and exclusion regions, we find that for heavy gluino masses the squark discovery reach is significantly reduced in Dirac gluino models relative to the Majorana case. However, if the squark and gluino masses are close the reach is similar in both scenarios. We also consider the electroweak fine tuning of theories observable at such a collider, and the impact of existing constraints from flavour and CP violating observables. Models with Majorana gluinos that are fine tuned to less than one part in 10, 000 can typically be discovered or excluded, and Dirac models with tuning of one part in 1, 000 can be probed. The flavour structure of Majorana models is highly constrained if they have observable squarks, while $$ \mathcal{O}(1) $$ violation is possible in accessible Dirac models. In both cases new sources of CP violation must be very suppressed. Future collider searches can also give important information on possible dark matter candidates. We study the relation of this to indirect and direct detection searches, and find that if dark matter is a neutralino, a 100 TeV collider could probe the viable dark matter candidates in large classes of both Dirac and Majorana models.
Highlights
Supersymmetric theories [14,15,16], and have received renewed interest because of potential phenomenologically appealing features [17,18,19]
We study the relation of this to indirect and direct detection searches, and find that if dark matter is a neutralino, a 100 TeV collider could probe the viable dark matter candidates in large classes of both Dirac and Majorana models
We consider the consequences of the projected collider reach for model building in the Majorana and Dirac scenarios, asking what flavour, dark matter, and fine tuning features a model must have in order that it is both allowed by current observations and discoverable at a 100 TeV collider
Summary
Hadron colliders are very efficient at producing strongly interacting states, and even though coloured superpartners are often amongst the heaviest they are important for the discovery or exclusion of theories. By employing a squark-gluinoneutralino simplified model, and scanning over squark and gluino masses, we obtain the expected discovery and exclusion reach of such a collider. The Dirac or Majorana nature of gluino masses leads to significant differences in the production rates in some parts of parameter space [19,20,21,22] and we highlight the effects of these. The bounds on the first two generation squark masses from 8 TeV data are found to be roughly in the region of 800 GeV for Dirac gluino masses of around 5 TeV, and are expected to reach somewhere in the region of 1.2 TeV with 14 TeV data [19, 22]
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