Coannihilation effects and relic abundance of higgsino-dominant LSPs

Mizuta, Satoshi; Yamaguchi, Masahiro

doi:10.1016/0370-2693(93)91717-2

Cited by 182 publications

(175 citation statements)

References 13 publications

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“…Alternatively, there might be one or more heavier supersymmetric particles that are nearly degenerate with the LSP, χ, and would have coannihilated with it in the early Universe [37]. There are several examples of possible coannihilating sparticles, including the lighter stau, or possibly some other slepton [38][39][40][41][42][43][44][45], the lighter stop squark [46][47][48][49][50][51][52][53][54][55][56], the lighter chargino [55,[57][58][59][60] and the gluino [56,[61][62][63][64][65][66][67][68][69][70][71][72].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

Scenarios for gluino coannihilation

Ellis

Evans

Luo

et al. 2016

J. High Energ. Phys.

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“…Since µ is now a free parameter, the neutralino can be Bino-like or Higgsino-like depending on the ratio of µ to m 1/2 . When the LSP is Higgsino-like, it is often nearly degenerate with the second lightest neutralino χ ′ and the lightest chargino χ ± [15]. All relevant coannihilation processes for this case, have been included.…”

Section: Introductionmentioning

confidence: 99%

The MSSM parameter space with non-universal Higgs masses

2002

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Without assuming that Higgs masses have the same values as other scalar masses at the input GUT scale, we combine constraints on the minimal supersymmetric extension of the Standard Model (MSSM) coming from the cold dark matter density with the limits from direct searches at accelerators such as LEP, indirect measurements such as b → sγ decay and the anomalous magnetic moment of the muon. The requirement that Higgs massessquared be positive at the GUT scale imposes important restrictions on the MSSM parameter space, as does the requirement that the LSP be neutral. We analyze the interplay of these constraints in the (µ, m A ), (µ, m 1/2 ), (m 1/2 , m 0 ) and (m A , tan β) planes. These exhibit new features not seen in the corresponding planes in the constrained MSSM in which universality is extended to Higgs masses.

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“…In R-parity conserving supersymmetric theories the LSP may be a neutralino, which is a good candidate to play the role of DM [16]. Many authors [17][18][19][20][21][22][23][24][25][26][27][28][29][30][10][11][12]31,32,35,36] have since calculated the relic neutralino density. In the early works, only the most important neutralino annihilation channels were considered, but later works [27,28] included all annihilation channels.…”

Section: Introductionmentioning

confidence: 99%

Neutralino relic density in a universe with a nonvanishing cosmological constant

2000

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We discuss the relic density of the lightest of the supersymmetric particles in view of new cosmological data, which favour the concept of an accelerating Universe with a non-vanishing cosmological constant. Recent astrophysical observations provide us with very precise values of the relevant cosmological parameters. Certain of these parameters have direct implications on particle physics, e.g., the value of matter density, which in conjunction with electroweak precision data put severe constraints on the supersymmetry breaking scale. In the context of the Constrained Minimal Supersymmetric Standard Model (CMSSM) such limits read as: M 1/2 ≃ 300 GeV − 340 GeV, m 0 ≃ 80 GeV − 130 GeV. Within the context of the CMSSM a way to avoid these constraints is either to go to the large tan β and µ > 0 region, or makeτ R , the next to lightest supersymmetric particle (LSP), be almost degenerate in mass with LSP.Pacs numbers: 95.30. Cq, 12.60.Jv, 95.35.+d

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Coannihilation effects and relic abundance of higgsino-dominant LSPs

Cited by 182 publications

References 13 publications

Scenarios for gluino coannihilation

Scenarios for gluino coannihilation

The MSSM parameter space with non-universal Higgs masses

Neutralino relic density in a universe with a nonvanishing cosmological constant

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