A Review of the Exceptional Supersymmetric Standard Model

King, Stephen F.; Moretti, Stefano; Nevzorov, R.

doi:10.3390/sym12040557

Cited by 19 publications

(10 citation statements)

References 194 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, nonminimal SUSY models with a richer structure than the MSSM and hallmark signatures, such as the Exceptional Supersymmetry Standard Model (E 6 SSM) of Refs. [5][6][7], including in its constrained version [8][9][10][11], may provide new DM candidates that account for the observed relic density without a conflict with other experimental constraints. The E 6 SSM is a string inspired SUSY scenario with an E 6 gauge group.…”

mentioning

confidence: 99%

Multi-component Dark Matter in a Simplified E$_6$SSM Model

Khalil,

Moretti,

Rojas-Ciofalo

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

We study Dark Matter (DM) in the Exceptional Supersymmetric Standard Model (E6SSM). The model has both active and inert Higgs superfields and by imposing discrete symmetries one can generate two DM candidates. We show that the lightest higgsinos of the active and inert sectors give a viable setup for two-component DM. We also illustrate the scope of both direct and indirect detection experiments in extracting such a DM sector. Future experiments of the former kind have a good chance of finding the active component while the inert higgsino will be very hard to detect while those of the latter kind will have no sensitivity to either candidate. I. INTRODUCTIONRecent Planck satellite observations of the fluctuations in the Cosmic Microwave Background (CMB) [1,2] confirmed that the largest part of our universe consists of invisible matter: Dark Matter (DM) for 26.8% and Dark Energy (DE) for 68.3% of it, while less than 5% of it is in the form of observable matter. Such a small part of visible matter is composed of (anti)quarks and (anti)leptons, in addition to gauge bosons. Therefore, it is not unrealistic to imagine that the DM sector is not minimal either and the assumption of multi-component DM is quite justified.In multi-component DM scenarios, we may have a combination of cold and warm DM that could explain the problem of small scale structure, where a discrepancy between collisionless cold DM and observational data was found [3]. Moreover, having multiple DM particles may provide interesting solutions for avoiding stringent constraints imposed nowadays from negative searches for DM at Direct Detection (DD) and Indirect Detection (ID) experiments and also at the Large Hadron Collider (LHC).A DM candidate is natural in the context of Supersymmetry (SUSY) with so-called R-parity conservation [4]. However, the minimal version of SUSY, the so-called Minimal Supersymmetric Standard Model (MSSM), contains only one DM candidate that has been widely studied in the literature. However, the combined LHC and relic abundance constraints rule out most of the MSSM parameter space except very narrow regions. Therefore, nonminimal SUSY models with a richer structure than the MSSM and hallmark signatures, such as the Exceptional Supersymmetry Standard Model (E 6 SSM) of Refs. [5][6][7], including in its constrained version [8][9][10][11], may provide new DM candidates that account for the observed relic density without a conflict with other experimental constraints. The E 6 SSM is a string inspired SUSY scenario with an E 6 gauge group. The E 6 gauge symmetry prevailing at the scale of a Grand Unification Theory (GUT) is then broken via1) N at lower energies. At such scales, wherein the E 6 SSM is essentially a Standard Model (SM) × U (1) N effective description from the viewpoint of a gauge theory, extra Right-Handed (RH) neutrinos are uncharged under U (1) N and can then acquire large intermediate scale Majorana masses leading to a Type-I see-saw mechanism to explain the small Left-Handed (LH) neutrino masses [12].In the E 6 SS...

show abstract

mentioning

confidence: 99%

Multi-component Dark Matter in a Simplified E$_6$SSM Model

Khalil,

Moretti,

Rojas-Ciofalo

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Extra U (1) symmetries in these string inspired models therefore possess an E 6 embedding and have generated multitude of papers since the mid-eighties (for a recent review see e.g. [12]). The construction of string derived models that admit an unbroken extra U (1) symmetry down to low scales proves, however, to be very difficult.…”

Section: Extra Z ′ In String Derived Modelsmentioning

confidence: 99%

$Z'$s and sterile neutrinos from heterotic string models: exploring $Z'$ mass exclusion limits

Faraggi,

Guzzi

2022

Preprint

View full text Add to dashboard Cite

We investigate the impact of sterile neutrinos on the decay rate of extra Z ′ s with mass in the TeV range in heterotic string derived models. We explore the impact of sterile neutrinos on the current Z ′ mass exclusion limits at the LHC, and how these bounds change when the parameter space of this specific class of models is modified. CONTENTSIntroduction 1 II. Extra Z ′ in string derived models 2 III. Neutral gauge bosons sector 3 IV. The Higgs sector 5 A. The CP-even sector 5 B. The CP-odd sector 6 C. The charged sector 6 V. The neutrino sector and sterile neutrinos 7 VI. Z ′ decay rates 8 VII. Collider signatures and Z ′ mass bounds 9 VIII. Discussion and conclusions 11 A. Rotation Matrix for the neutral gauge boson fields 12 B. Z ′ decay rates 12 1. Z ′ decay rates in W + W − and ZH 0 i 12 2. Z ′ decay rates in two Higgs bosons 12 3. Z ′ decay rates into W ± H ∓ 13 4. Z ′ decay rates into H + H − 13 References 13 I.

show abstract

“…The E 6 SSM is a Supersymmetry (SUSY) extension of the Standard Model (SM) inspired by string theory, with an exceptional gauge unification group of E 6 type [1][2][3][4][5][6][7][8]. This a e-mail: harri.waltari@physics.uu.se (corresponding author) model provides a natural framework to account for neutrino masses and solving the μ-problem of SUSY.…”

Section: Introductionmentioning

confidence: 99%

A combined approach to the analysis of space and ground experimental data within a simplified E$$_6$$SSM

et al. 2022

Self Cite

View full text Add to dashboard Cite

Within the Exceptional Supersymmetric Standard Model (E$$_6$$ 6 SSM), we investigate signatures at the Large Hadron Collider (LHC) for a long-lived charged inert higgsino, which is degenerate with the inert neutralino at tree level and a small mass splitting is generated at the loop level, resulting in a lifetime $$\mathcal{O}(0.02)$$ O ( 0.02 ) nanoseconds. We focus on the most sensitive search for long-lived charged inert higgsino decays to the lightest neutral inert higgsino dark matter and very soft charged leptons, which are eventually stopped in the detector resulting in a disappearing-track signal. Furthermore, we study the displaced vertex signature of the inert chargino in the case where it is produced via the $$Z^{\prime }$$ Z ′ portal. We illustrate how difficult it is to construct displaced vertices in this class of models, though some evidence could be gained at the High Luminosity LHC. Finally, we compare the spin independent and spin dependent cross sections of the lightest inert higgsino DM to those of current direct detection experiments, proving that it is possible to gain sensitivity to the active DM component of this scenario in the near future. The combination of these signatures with the one emerging from $$Z'$$ Z ′ production and decay via Drell–Yan, which can be characterised as belonging to the E$$_6$$ 6 SSM via both the cross section and Forward–Backward Asymmetry, could point uniquely to this non-minimal realisation of Supersymmetry.

show abstract

A Review of the Exceptional Supersymmetric Standard Model

Cited by 19 publications

References 194 publications

Multi-component Dark Matter in a Simplified E$_6$SSM Model

Multi-component Dark Matter in a Simplified E$_6$SSM Model

$Z'$s and sterile neutrinos from heterotic string models: exploring $Z'$ mass exclusion limits

A combined approach to the analysis of space and ground experimental data within a simplified E$$_6$$SSM

Contact Info

Product

Resources

About