Antisplit Supersymmetry

Abstract

I explore the phenomenology of Supersymmetry models in which the gauginos are much heavier then that scalar particles of the MSSM. In these models, the gauginos are inaccessible to colliders while the scalar spectrum is compressed. I give several examples of models which exhibit this phenomenology built in the class of General Gauge Mediated Models. I explore possible LSP and NLSP candidates in these scenarios including Higgsino, stau, and sneutrino candidates. Collider signatures for these models include multi-particle decay chains, many taus in the final state, and possible displaced vertices with semi-long lived sparticles. I enumerate the most likely collider smoking gun collider signatures for each general LSP/NLSP scenario.

Exploring color-octet scalar parameter space in minimal R-symmetric models

“…The choice of LSP has a large effect on decay chains and collider limits on superpartners in Dirac gaugino models [22]. We choose to study a conservative LSP scenario natural to models with heavy Dirac gaugino masses.…”

Exploring color-octet scalar parameter space in minimal $R$-symmetric models

“…4. The choice of LSP has a large effect on decay chains and collider limits on superpartners in Dirac gaugino models [22]. We choose to study a conservative LSP scenario natural to models with heavy Dirac gaugino masses.…”

Exploring Non-Universal Gauge Mediation

“…The most minimal model uses a single spurion field and one set of messengers in a fundamental representation of SU (5). The entire SUSY mass spectrum depends on a single parameter, Λ = F/v.…”

“…Among the leading formalisms for the communication of SUSY breaking is Gauge Mediation, which allows predictive, calculable models, and is flavor bind [1][2] [3]. To implement Gauge Mediation most minimally, heavy fields in full SU (5) multiplets, the messengers, couple both to the spurions of SUSY breaking and to the MSSM fields through Standard Model gauge interactions. The messengers have a supersymmetric and non-supersymmetric mass, inducing gaugino masses at the one loop level and scalar mass squared's at the two loop level.…”

“…The features of the Supersoft spectra are quite distinct from that of Minimal Gauge Mediation. With small additions to the minimal theory-the gauginos may be made arbitrarily heavier than the scalars, only the sfermions and Higgsino-like weakinos remain light (heavy binos and winos are not collider accessible) [5]. The phenomenology is considered 'collider safe' as the heavy gluino is not expected to be produced at the LHC, and due to decreased production cross sections for squarks, lower mass bounds are relaxed [6].…”