Locally Supersymmetric Grand Unification

Chamseddine, Ali H.; Arnowitt, R.; Nath, Pran

doi:10.1103/physrevlett.49.970

Cited by 1,637 publications

(1,756 citation statements)

References 11 publications

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“…(1.1). For instance, in the mSUGRA model [6], almost all of parameter space is excluded by the precisely measured abundance, and only a few distinct regions where neutralino annihilation is enhanced survive: the nearly excluded bulk region with low masses already mentioned above [7], the stau [8] or stop [9] co-annihilation regions, the hyperbolic branch/focus point (HB/FP) region at large m 0 [10], where the Z 1 becomes mixed higgsino dark matter (with enhanced annihilation to W and Z particles via its higgsino component), or the A or h resonance annihilation (Higgs funnel) region [11,12]. Within the mSUGRA framework, each of these regions leads to characteristic patterns in collider signals at the soon-to-be-operational CERN Large Hadron Collider (LHC), and also to differences in signals in direct and indirect DM search experiments under way.…”

Section: Jhep10(2007)088mentioning

confidence: 99%

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Mixed higgsino dark matter from a large SU(2) gaugino mass

Baer

Mustafayev

Summy

et al. 2007

J. High Energy Phys.

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We observe that in SUSY models with non-universal GUT scale gaugino mass parameters, raising the GUT scale SU(2) gaugino mass |M 2 | from its unified value results in a smaller value of −m 2Hu at the weak scale. By the electroweak symmetry breaking conditions, this implies a reduced value of µ 2 visà vis models with gaugino mass unification. The lightest neutralino can then be mixed Higgsino dark matter with a relic density in agreement with the measured abundance of cold dark matter (DM). We explore the phenomenology of this high |M 2 | DM model. The spectrum is characterized by a very large wino mass and a concomitantly large splitting between left-and right-sfermion masses. In addition, the lighter chargino and three light neutralinos are relatively light with substantial higgsino components. The higgsino content of the LSP implies large rates for direct detection of neutralino dark matter, and enhanced rates for its indirect detection relative to mSUGRA. We find that experiments at the LHC should be able to discover SUSY over the portion of parameter space where mg < ∼ 2350 − 2750 GeV, depending on the squark mass, while a 1 TeV electron-positron collider has a reach comparable to that of the LHC. The dilepton mass spectrum in multi-jet + ℓ + ℓ − + E miss T events at the LHC will likely show more than one mass edge, while its shape should provide indirect evidence for the large higgsino content of the decaying neutralinos.

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Section: Jhep10(2007)088mentioning

confidence: 99%

“…For comparison, we also show projections using the Burkert profile [43] where the central cusp in the DM halo is smoothed out by significant heating of cold particles. 6 In our analysis, we consider signals from the following processes.…”

Section: Direct and Indirect Detection Of Neutralino Cdmmentioning

confidence: 99%

Mixed higgsino dark matter from a large SU(2) gaugino mass

Baer

Mustafayev

Summy

et al. 2007

J. High Energy Phys.

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“…The hidden-sector scenario for supersymmetry (SUSY) breaking is arguably the simplest and most natural mechanism for realizing SUSY in nature [1]. In this scenario, one assumes that SUSY is broken in a hidden sector that couples only gravitationally to observable fields.…”

Section: Introductionmentioning

confidence: 99%

Realistic anomaly-mediated supersymmetry breaking

Chacko

Luty

Maksymyk

et al. 2000

J. High Energy Phys.

136

111

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We consider supersymmetry breaking communicated entirely by the superconformal anomaly in supergravity. This scenario is naturally realized if supersymmetry is broken in a hidden sector whose couplings to the observable sector are suppressed by more than powers of the Planck scale, as occurs if supersymmetry is broken in a parallel universe living in extra dimensions. This scenario is extremely predictive: soft supersymmetry breaking couplings are completely determined by anomalous dimensions in the effective theory at the weak scale. Gaugino and scalar masses are naturally of the same order, and flavor-changing neutral currents are automatically suppressed. The most glaring problem with this scenario is that slepton masses are negative in the minimal supersymmetric standard model. We point out that this problem can be simply solved by coupling extra Higgs doublets to the leptons. Lepton flavor-changing neutral currents can be naturally avoided by approximate symmetries. We also describe more speculative solutions involving compositeness near the weak scale. We then turn to electroweak symmetry breaking. Adding an explicit µ term gives a value for Bµ that is too large by a factor of ∼ 100. We construct a realistic model in which the µ term arises from the vacuum expectation value of a singlet field, so all weak-scale masses are directly related to m 3/2 . We show that fully realistic electroweak symmetry breaking can occur in this model with moderate fine-tuning. *

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“…In the widely studied context of minimal supergravity (mSUGRA) [6], a special realization of the MSSM, coannihilations are often thought to be synonym of suppression of the neutralino relic abundance. In mSUGRA the neutralino is Bino-like (i.e.…”

Section: Introductionmentioning

confidence: 99%

Increasing the neutralino relic abundance with slepton coannihilations: consequences for indirect dark matter detection

Profumo

Provenza

2006

J. Cosmol. Astropart. Phys.

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We point out that if the lightest supersymmetric particle (LSP) is a Higgsinoor Wino-like neutralino, the net effect of coannihilations with sleptons is to increase the relic abundance, rather than producing the usual suppression, which takes place if the LSP is Bino-like. The reason for the enhancement lies in the effective thermally averaged cross section at freeze-out: sleptons annihilate (and co-annihilate) less efficiently than the neutralino(s)-chargino system, therefore slepton coannihilations effectively act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic abundance of LSP's corresponds to the cold Dark Matter abundance for smaller values of the LSP mass, and larger values of the neutralino pair annihilation cross section. In turn, at a given thermal neutralino relic abundance, this implies larger indirect detection rates, as a result of an increase in the fluxes of antimatter, gamma rays and neutrinos from the Sun originating from neutralino pair annihilations.

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Locally Supersymmetric Grand Unification

Cited by 1,637 publications

References 11 publications

Mixed higgsino dark matter from a large SU(2) gaugino mass

Mixed higgsino dark matter from a large SU(2) gaugino mass

Realistic anomaly-mediated supersymmetry breaking

Increasing the neutralino relic abundance with slepton coannihilations: consequences for indirect dark matter detection

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