Late energy injection and cosmological constraints in axino dark matter scenarios

Freitas, Ayres; Steffen, Frank; Tajuddin, Nurhana; Wyler, D.

doi:10.1016/j.physletb.2009.10.094

Cited by 13 publications

(30 citation statements)

References 54 publications

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“…The extremely weak interactions between the axino and charged slepton allow a long-lived NLSP charged slepton such as the lighter stau (τ 1 ). These long-lived staus, which were also called charged massive particles However, the Long-lived staus can cause problem and violate various cosmological bounds such as the Big Bang Nucleosyntheis bounds [72], catalyst BBN bounds [73,74,75] and structure formation bounds [76]. Thus, in such a scenario, one should have a mechanism through which the lifetime of the lighter stau via decay to the axino LSP is within reasonable time, 6 See [38] and references therein for phenomenological issues related to No-Scale models.…”

Section: Dark Matter In No-scale Mssmmentioning

confidence: 99%

Supernatural MSSM

Nanopoulos

Raza

et al. 2015

Phys. Rev. D

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We point out that the electroweak fine-tuning problem in the supersymmetric Standard Models (SSMs) is mainly due to the high energy definition of the fine-tuning measure. We propose super-natural supersymmetry which has an order one high energy fine-tuning measure automatically. The key point is that all the mass parameters in the SSMs arise from a single supersymmetry breaking parameter. In this paper, we show that there is no supersymmetry electroweak fine-tuning problem explicitly in the Minimal SSM (MSSM) with no-scale supergravity and Giudice-Masiero (GM) mechanism. We demonstrate that the Z-boson mass, the supersymmteric Higgs mixing parameter µ at the unification scale, and the sparticle spectrum can be given as functions of the universal gaugino mass M 1/2 . Because the light stau is the lightest supersymmetric particle (LSP) in the no-scale MSSM, to preserve R parity, we introduce a 1 E-mail:gldu@itp.ac.cn 2 E-mail:tli@itp.ac.cn 3 E-mail:dimitri@physics.tamu.edu 4 E-mail:shabbar@itp.ac.cn 1 arXiv:1502.06893v1 [hep-ph] 24 Feb 2015 non-thermally generated axino as the LSP dark matter candidate. We estimate the lifetime of the light stau by calculating its 2-body and 3-body decays to the LSP axino for several values of axion decay constant f a , and find that the light stau has a lifetime ττ 1 in [10 −4 , 100] s for an f a range [10 9 , 10 12 ] GeV. We show that our next to the LSP stau solutions are consistent with all the current experimental constraints, including the sparticle mass bounds, B-physics bounds, Higgs mass, cosmological bounds, and the bounds on long-lived charge particles at the LHC.

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Section: Dark Matter In No-scale Mssmmentioning

confidence: 99%

Supernatural MSSM

Nanopoulos

Raza

et al. 2015

Phys. Rev. D

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“…[2][3][4] and collider signatures in refs. [8][9][10][17][18][19]. If the LHC does not confirm the decay of heavy squarks or gluino to a lighter neutralino, the axino CDM idea with the R-parity conservation can not be saved unless some other mechanisms such as an effective SUSY is introduced [40,41].…”

Section: Jhep04(2012)106mentioning

confidence: 99%

“…[4] and more recently re-derived in ref. [8][9][10] in a full two-loop computation. This coupling is smaller and not important for thermal production, but it is important for the non-thermal production when the stau is the NLSP.…”

Section: Jhep04(2012)106mentioning

confidence: 99%

“…[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%

“…Ways of testing the axino CDM scenario at the LHC were explored in refs. [8][9][10][17][18][19] and implications for Affleck-Dine Baryogenesis in ref. [20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Axinos in cosmology and at colliders

Freitas

Steffen

Tajuddin

et al. 2011

J. High Energ. Phys.

Self Cite

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The axino, the fermionic superpartner of the axion, is a well-motivated candidate for cold dark matter if it is the lightest supersymmetric particle. Since the axino couples very weakly to the matter multiplets, the next-to-lightest supersymmetric particle (NLSP) has a long lifetime, which has important consequences for both cosmology and collider phenomenology. Assuming that a charged slepton is the NLSP, we calculate the complete leading one-and two-loop contributions to its decay. We analyze in detail constraints on the parameters space from cosmology and discuss how this scenario can be probed at colliders. Scenarios in which both the axino and the gravitino are lighter than the long-lived charged slepton are also explored with particular emphasis on cosmological constraints and collider phenomenology.

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Late energy injection and cosmological constraints in axino dark matter scenarios

Cited by 13 publications

References 54 publications

Supernatural MSSM

Supernatural MSSM

Axino cold dark matter revisited

Axinos in cosmology and at colliders

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