Hunting long-lived gluinos at the Pierre Auger Observatory

Anchordoqui, Luis A.; Delgado, A.; Canal, C. A. García; Sciutto, S. J.

doi:10.1103/physrevd.77.023009

Cited by 11 publications

(10 citation statements)

References 113 publications

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“…There are many kinds of studies about decaying dark matter, in particular, constraining its lifetime Γ −1 [5][6][7][8][9][10][11][12][13][14][15][16][17]. For example, the light element abundances predicted by Big-Bang Nucleosynthesis set the limit on the lifetime if the lifetime is relatively short [12,16].…”

Section: Introductionmentioning

confidence: 99%

Formulation and constraints on decaying dark matter with finite mass daughter particles

Aoyama

Ichiki

Nitta

et al. 2011

J. Cosmol. Astropart. Phys.

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Abstract. Decaying dark matter cosmological models have been proposed to remedy the overproduction problem at small scales in the standard cold dark matter paradigm. We consider a decaying dark matter model in which one CDM mother particle decays into two daughter particles, with arbitrary masses. A complete set of Boltzmann equations of dark matter particles is derived which is necessary to calculate the evolutions of their energy densities and their density perturbations. By comparing the expansion history of the universe in this model and the free-streaming scale of daughter particles with astronomical observational data, we give constraints on the lifetime of the mother particle, Γ −1 , and the mass ratio between the daughter and the mother particles m D /m M . From the distance to the last scattering surface of the cosmic microwave background, we obtain Γ −1 > 30 Gyr in the massless limit of daughter particles and, on the other hand, we obtain m D > 0.97m M in the limit Γ −1 → 0. The free-streaming constraint tightens the bound on the mass ratio as Γ −1 /10 −2 Gyr (1 − m D1 /m M )/10 −2 −3/2 for Γ −1 < H −1 (z = 3).

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Section: Introductionmentioning

confidence: 99%

Formulation and constraints on decaying dark matter with finite mass daughter particles

Aoyama

Ichiki

Nitta

et al. 2011

J. Cosmol. Astropart. Phys.

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“…Cosmological implications of DDM have been studied by several authors [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Among them, Kaplinghat [10] and Huo [19] have considered models in which dark matter decays into two "daughter" particles 1 well before the matter-radiation equality epoch.…”

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confidence: 99%

Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products

Aoyama

Sekiguchi

Ichiki

et al. 2014

J. Cosmol. Astropart. Phys.

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Decaying dark matter (DDM) is a candidate which can solve the discrepancies between predictions of the concordance ΛCDM model and observations at small scales such as the number counts of companion galaxies of the Milky Way and the density profile at the center of galaxies. Previous studies are limited to the cases where the decay particles are massless and/or have almost degenerate masses with that of mother particles. Here we expand the DDM models so that one can consider the DDM with arbitrary lifetime and the decay products with arbitrary masses. We calculate the time evolutions of perturbed phase-space distribution functions of decay products for the first time and study effects of DDM on the temperature anisotropy in the cosmic microwave background and the matter power spectrum at present. From a recent observational estimate of σ 8 , we derive constraints on the lifetime of DDM and the mass ratio between the decay products and DDM. We also discuss implications of the DDM model for the discrepancy in the measurements of σ 8 recently claimed by the Planck satellite collaboration.

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“…Guided by these results, we consider the possibility of detecting at the LHC stable stops with masses in excess of the excluded lower limit ∼ 249 GeV/c 2 [21]. This work complements studies which have been made of the discovery potential of R-hadrons at the LHC [22,23,24,25] and at cosmic ray facilities such as the Pierre Auger [26] and IceCube [27] experiments.…”

Section: Introductionmentioning

confidence: 77%

Long-lived stops in MSSM scenarios with a neutralino LSP

Johansen

Edsjö

Hellman

et al. 2010

J. High Energ. Phys.

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This work investigates the possibility of a long-lived stop squark in supersymmetric models with the neutralino as the lightest supersymmetric particle (LSP). We study the implications of meta-stable stops on the sparticle mass spectra and the dark matter density. We find that in order to obtain a sufficiently long stop lifetime so as to be observable as a stable R-hadron at an LHC experiment, we need to fine tune the mass degeneracy between the stop and the LSP considerably. This increases the stop-neutralino coanihilation cross section, leaving the neutralino relic density lower than what is expected from the WMAP results for stop masses ~1.5 TeV/c^2. However, if such scenarios are realised in nature we demonstrate that the long-lived stops will be produced at the LHC and that stop-based R-hadrons with masses up to 1 TeV/c^2 can be detected after one year of running at design luminosity

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Hunting long-lived gluinos at the Pierre Auger Observatory

Cited by 11 publications

References 113 publications

Formulation and constraints on decaying dark matter with finite mass daughter particles

Formulation and constraints on decaying dark matter with finite mass daughter particles

Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products

Long-lived stops in MSSM scenarios with a neutralino LSP

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