Neutralino, axion and axino cold dark matter in minimal, hypercharged and gaugino AMSB

Baer, Howard; Dermíšek, Radovan; Rajagopalan, S.; Summy, Heaya

doi:10.1088/1475-7516/2010/07/014

Cited by 31 publications

(32 citation statements)

References 125 publications

(123 reference statements)

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“…A neutral higgsino is thus the lightest supersymmetric particle (LSP), which is consistent with cosmological limits on the dark matter density: the thermal higgsino relics are typically below the observed value of the relic density [12]. However, scenarios with low thermal relic density can be consistent with the measured abundance [53][54][55].…”

Section: Other Phenomenological Constraintssupporting

confidence: 64%

The NMSSM lives: with the 750 GeV diphoton excess

et al. 2016

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We propose an NMSSM scenario that can explain the excess in the diphoton spectrum at 750 GeV recently observed by ATLAS and CMS. We show that in a certain limit with a very light pseudoscalar one can reproduce the experimental results without invoking exotic matter. The 750 GeV excess is produced by two resonant heavy Higgs bosons with masses ∼750 GeV, which subsequently decay to two light pseudoscalars. Each of these decays to collimated photon pairs that appear as a single photon in the electromagnetic calorimeter. A mass gap between heavy Higgses mimics a large width of the 750 GeV peak. The production mechanism, containing a strong component via initial b quarks, ameliorates a possible tension with 8 TeV data compared to other production modes. We also discuss other constraints, in particular from low-energy experiments. Finally, we discuss possible methods that could distinguish our proposal from other physics models describing the diphoton excess in the Run-II of the LHC.

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Section: Other Phenomenological Constraintssupporting

confidence: 64%

The NMSSM lives: with the 750 GeV diphoton excess

et al. 2016

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“…In fact, the neutralino production via axino decay and subsequent re-annihilation effect offers an elegant means to enhance the WIMP relic density in SUSY models with higgsino or wino-like WIMPs. This mechanism offers an alternative [26] to the neutralino abundance enhancement via moduli decays as proposed by Morio and Randall [36] for AMSB, and as proposed by Kane et al to explain the Pamela/Fermi cosmic ray anomalies [37]. By the time T D exceeds T f r , the axion abundance has assumed the value given by Eq.…”

Section: Numerical Resultsmentioning

confidence: 85%

Mixed axion/neutralino cold dark matter in supersymmetric models

Baer¹,

Lessa²,

Rajagopalan³

et al. 2011

J. Cosmol. Astropart. Phys.

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116

142

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We consider supersymmetric (SUSY) models wherein the strong CP problem is solved by the Peccei-Quinn (PQ) mechanism with a concommitant axion/axino supermultiplet. We examine R-parity conserving models where the neutralino is the lightest SUSY particle, so that a mixture of neutralinos and axions serve as cold dark matter (a Z 1 CDM). The mixed a Z 1 CDM scenario can match the measured dark matter abundance for SUSY models which typically give too low a value of the usual thermal neutralino abundance, such as models with wino-like or higgsino-like dark matter. The usual thermal neutralino abundance can be greatly enhanced by the decay of thermally-produced axinos (ã) to neutralinos, followed by neutralino re-annihilation at temperatures much lower than freeze-out. In this case, the relic density is usually neutralino dominated, and goes as ∼ (f a /N )/m 3/2 a . If axino decay occurs before neutralino freeze-out, then instead the neutralino abundance can be augmented by relic axions to match the measured abundance. Entropy production from late-time axino decays can diminish the axion abundance, but ultimately not the neutralino abundance. In a Z 1 CDM models, it may be possible to detect both a WIMP and an axion as dark matter relics. We also discuss possible modifications of our results due to production and decay of saxions. In the appendices, we present expressions for the Hubble expansion rate and the axion and neutralino relic densities in radiation, matter and decaying-particle dominated universes.

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“…[1,2]. The scenario was subsequently extensively studied during the last decade [3][4][5][6][7][8][9][10][11][12][13][14][15][16], with either a neutralino or a stau as the next-to-lightest supersymmetric particle (NLSP). Ways of testing the axino CDM scenario at the LHC were explored in refs.…”

Section: Introductionmentioning

confidence: 99%

Axino cold dark matter revisited

Choi

Covi

Kim

et al. 2012

J. High Energ. Phys.

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Axino arises in supersymmetric versions of axion models and is a natural candidate for cold or warm dark matter. Here we revisit axino dark matter produced thermally and non-thermally in light of recent developments. First we discuss the definition of axino relative to low energy axion one for several KSVZ and DFSZ models of the axion. Then we review and refine the computation of the dominant QCD production in order to avoid unphysical cross-sections and, depending on the model, to include production via SU(2) and U(1) interactions and Yukawa couplings.

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Neutralino, axion and axino cold dark matter in minimal, hypercharged and gaugino AMSB

Cited by 31 publications

References 125 publications

The NMSSM lives: with the 750 GeV diphoton excess

The NMSSM lives: with the 750 GeV diphoton excess

Mixed axion/neutralino cold dark matter in supersymmetric models

Axino cold dark matter revisited

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