LHC limits on gluinos and squarks in the minimal Dirac gaugino model

Abstract

Dirac gauginos are a well-motivated extension of the MSSM, leading to interesting phenomenological consequences. At the LHC, gluino-pair production is enhanced while squark production is suppressed as compared to the MSSM, and the decay signatures are altered by a more complex chargino and neutralino spectrum. We investigate how this impacts current gluino and squark mass limits from Run 2 of the LHC. Concretely, we compare different assumptions about the electroweak-ino spectrum through four benchmark models paying particular attention to the effect of the trilinear λ S coupling, which induces a mass splitting between the mostly bino/U(1) adjoint states. Among other results, we show that for large λ S the additionalχ 0 2 → ffχ 0 1 decays somewhat weaken the limits on gluinos (squarks) in the case of heavy squarks (gluinos). Moreover, we compare the limits in the gluino vs. squark mass plane to those obtained in equivalent MSSM scenarios.

Reinterpretation of LHC Results for New Physics: Status and recommendations after Run 2

“…The downside is that the applicability is limited by the simplified-model results available. Moreover, whenever the tested signal splits up into many different channels, as typically the case in complex models with several new particles, the derived limits tend to be highly conservative and often far too weak [88,89]. Tools which evaluate cross-section × branching ratio limits for specific models/signatures, such as HiggsBounds [90,91] for additional Higgs bosons, ZPEED [92] for Z resonances, and Dark-Cast [93] for dark photons, also fall into this class.…”

Mixed gluinos and sgluons from a new SU(3) gauge group

“…The collider phenomenology of colorons, Dirac and mixed Majorana/Dirac gluinos, and sgluons has already been the subject of many papers, see refs. [9, 12-18, 21, 22, 65, 66], and [67][68][69][70][71][72][73], and [74][75][76][77][78][79], respectively. A detailed discussion of the LHC phenomenology is beyond the scope of the present paper, but a few brief comments are in order, with emphasis on qualitative issues where the model described above differs from the situation encountered in previous studies based on pure Dirac gluinos from supersoft and and hybrid models with an N = 2 gauge sector.…”

Precise prediction for the W boson mass in the MRSSM

“…The LHC phenomenology of the Minimal R-symmetric Supersymmetric Standard Model (MRSSM) [5] and other models with R-symmetry has recently been explored in refs. [6][7][8][9][10][11][12][13][14][15]. The signatures of the MRSSM differ from the ones of the MSSM as the model includes Dirac gauginos and higgsinos instead of Majorana ones.…”