Aspects of Split Supersymmetry

Arkani-Hamed, Nima; Dimopoulos, Savas; Giudice, Gian F.; Romanino, Andrea

doi:10.1016/j.nuclphysb.2004.12.026

Cited by 629 publications

(709 citation statements)

References 84 publications

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“…Finally, it is worth noting that a gluino LOSP gives a signal very similar to that for split-supersymmetry [42,43], namely a three-body decay mode,x → qqx ′ . How-…”

Section: Jhep03(2011)085mentioning

confidence: 93%

Origins of hidden sector dark matter II: collider physics

Cheung

Elor

Hall

et al. 2011

J. High Energ. Phys.

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We consider a broad class of supersymmetric theories in which dark matter (DM) is the lightest superpartner (LSP) of a hidden sector that couples very weakly to visible sector fields. Portal interactions connecting visible and hidden sectors mediate the decay of the lightest observable superpartner (LOSP) into the LSP, allowing the LHC to function as a spectacular probe of the origin of hidden sector DM. As shown in a companion paper, this general two-sector framework allows only for a handful of DM production mechanisms, each of which maps to a distinctive window in lifetimes and crosssections for the LOSP. In the present work we perform a systematic collider study of LOSP candidates and portal interactions, and for each case evaluate the prospects for successfully reconstructing the origin of DM at the LHC. If, for instance, DM arises from Freeze-Out and Decay, this may be verified if the LOSP is a bino or right-handed slepton decaying to the LSP through a variety of portal interactions, and with an annihilation cross-section within a narrow range. On the other hand, the Freeze-In mechanism may be verified for a complimentary set of LOSP candidates, and within a narrow range of LOSP lifetimes. In all cases, the LOSP is relatively long-lived on collider time scales, leading to events with displaced vertices. Furthermore, scenarios with a charged or colored LOSP are particularly promising.

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“…Finally, it is worth noting that a gluino LOSP gives a signal very similar to that for split-supersymmetry [42,43], namely a three-body decay mode,x → qqx ′ . How-…”

Section: Jhep03(2011)085mentioning

confidence: 93%

Origins of hidden sector dark matter II: collider physics

Cheung

Elor

Hall

et al. 2011

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…The gaugino masses in these models are generated by anomalies [140][141][142][143][144]. Because the contributions to gaugino masses are proportional to m 3/2 times the gauge coupling beta function, the scalar masses tend to be much heavier than the gaugino masses, reminiscent of split supersymmetry [145][146][147][148][149]. With the addition of the 10 and 10, the anomaly-mediated contributions to the gaugino masses are 8…”

Section: Jhep02(2016)071mentioning

confidence: 99%

Scenarios for gluino coannihilation

Ellis

Evans

Luo

et al. 2016

J. High Energ. Phys.

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We study supersymmetric scenarios in which the gluino is the next-to-lightest supersymmetric particle (NLSP), with a mass sufficiently close to that of the lightest supersymmetric particle (LSP) that gluino coannihilation becomes important. One of these scenarios is the MSSM with soft supersymmetry-breaking squark and slepton masses that are universal at an input GUT renormalization scale, but with non-universal gaugino masses. The other scenario is an extension of the MSSM to include vector-like supermultiplets. In both scenarios, we identify the regions of parameter space where gluino coannihilation is important, and discuss their relations to other regions of parameter space where other mechanisms bring the dark matter density into the range allowed by cosmology. In the case of the non-universal MSSM scenario, we find that the allowed range of parameter space is constrained by the requirement of electroweak symmetry breaking, the avoidance of a charged LSP and the measured mass of the Higgs boson, in particular, as well as the appearance of other dark matter (co)annihilation processes. Nevertheless, LSP masses m χ 8 TeV with the correct dark matter density are quite possible. In the case of pure gravity mediation with additional vector-like supermultiplets, changes to the anomalymediated gluino mass and the threshold effects associated with these states can make the gluino almost degenerate with the LSP, and we find a similar upper bound.

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“…One can also consider a phenomenological scenario similar to split supersymmetry [19], in which all superparticles which remain light are there for a reason [20]. In this case, a…”

Section: Scenarios With Light Scalar Top Quarksmentioning

confidence: 99%

Light stop searches at the LHC in events with one hard photon or jet and missing energy

Carena

Freitas

Wagner

2008

J. High Energy Phys.

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Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the origin of the baryon asymmetry and the source of dark matter. In the MSSM, weak scale generation of the baryon asymmetry may be achieved in the presence of light stops, with masses lower than about 130 GeV. Moreover, the proper dark matter density may be obtained in the stop-neutralino co-annihilation region, where the stop-neutralino mass difference is smaller than a few tens of GeV. Searches for scalar top quarks (stops) in pair production processes at the Tevatron and at the Large Hadron Collider (LHC) become very challenging in this region of parameters. At the LHC, however, light stops proceeding from the decay of gluino pairs may be identified, provided the gluino mass is smaller than about 900 GeV. In this article we propose an alternative method for stop searches in the co-annihilation region, based on the search for these particles in events with missing energy plus one hard photon or jet. We show that this method is quite efficient and, when complemented with ongoing Tevatron searches, allows to probe stop masses up to about 160 GeV, fully probing the region of parameters consistent with electroweak baryogenesis in the MSSM. * Very recently, however, it was proposed that the reach of the Tevatron for small mass differences could be extended by not requiring full reconstruction of the two charm jets [10].

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Aspects of Split Supersymmetry

Cited by 629 publications

References 84 publications

Origins of hidden sector dark matter II: collider physics

Origins of hidden sector dark matter II: collider physics

Scenarios for gluino coannihilation

Light stop searches at the LHC in events with one hard photon or jet and missing energy

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