Direct detection signatures of self-interacting dark matter with a light mediator

Nobile, Eugenio Del; Kaplinghat, Manoj; Yu, Hai-Bo

doi:10.1088/1475-7516/2015/10/055

Cited by 78 publications

(97 citation statements)

References 78 publications

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“…Following the analysis in Ref. [47], we place the upper bound on on the dark photon 10 It follows that M * 10M R × (m ν /0. parameter from the 54 ton×day exposure of PandaX-II [48] in Fig.…”

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confidence: 99%

Composite asymmetric dark matter with a dark photon portal

Ibe

Kamada

Kobayashi

et al. 2018

J. High Energ. Phys.

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Asymmetric dark matter (ADM) is an attractive framework relating the observed baryon asymmetry of the Universe to the dark matter density. A composite particle in a new strong dynamics is a promising candidate for ADM as the strong dynamics naturally explains the ADM mass in the GeV range. Its large annihilation cross section due to the strong dynamics leaves the asymmetric component to be dominant over the symmetric component. In such composite ADM scenarios, the dark sector has a relatively large entropy density in the early Universe. The large dark sector entropy results in the overclosure of the Universe or at best contradicts with the observations of the cosmic microwave background and the successful Big-Bang Nucleosynthesis. Thus, composite ADM models generically require some portal to transfer the entropy of the dark sector into the Standard Model sector. In this paper, we consider a dark photon portal with a mass in the sub-GeV range and kinetic mixing with the Standard Model photon. We investigate the viable parameter space of the dark photon in detail, which can find broad applications to dark photon portal models. We also provide a simple working example of composite ADM with a dark photon portal. Our model is compatible with thermal leptogenesis and B − L symmetry. By taking into account the derived constraints, we show that the parameter space is largely tested by direct detection experiments. *

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confidence: 99%

Composite asymmetric dark matter with a dark photon portal

Ibe

Kamada

Kobayashi

et al. 2018

J. High Energ. Phys.

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“…In many well-motivated DM models, the DM particles do not couple to the SM particles directly, but through some light color-singlet mediator particles, which has rich phenomenological consequences in DM annihilation [10][11][12], self-scatterings [13][14][15] and solar capture [16,17], and direct detections [18,19]. In this scenario, for the same DM mass, the resulting energy spectrum of final state particle from DM annihilation can be significantly different from the case without a mediator.…”

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confidence: 99%

Antiprotons from dark matter annihilation through light mediators and a possible excess in AMS-02 p¯/p data

Huang

Wei

et al. 2017

Phys. Rev. D

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We show that in the scenario where dark matter (DM) particles annihilate through light mediators, the energy spectra of the final state cosmic-ray particles depend strongly on the mediator mass. For final state antiprotons, a spectrum with relatively narrow peak occurs when the mediator mass is comparable to thepp production threshold. Of interest, the latest AMS-02 data on thep/p flux ratio hint at a bump-like excess over the expected background in the energy range ∼ 100 − 450 GeV. We show that such a light mediator scenario is favoured by the latest AMS-02 data over the scenarios of DM direct annihilation into the standard model particles and that of antiprotons produced from inside supernova remnants (SNRs), and is consistent with the upper limits derived from the Fermi-LAT data on the gamma rays towards the dwarf spheroidal galaxies. Thep/p flux ratio with energy above 450 GeV is predicted to fall with energy quickly, which can be easily distinguished from the other two scenarios as they predict the ratio to be flattening or rising up to multi-TeV region.Introduction. Cosmic-ray (CR) antiparticles such as positrons and antiprotons are relatively rare and sensitive to exotic contributions. In recent years, an excess over the expected background in CR positrons has been observed [1]. The spectral feature of the excess plays an important role in identifying its origin such as nearby astrophysical sources or dark matter (DM) interactions. Recently, the AMS-02 collaboration published the measurement on the antiproton to proton (p/p) flux ratio up to kinetic energy 450 GeV, based on four years of data taking [2], confirming the first preliminary result presented in the year 2015 [3]. Although the measured kinetic energy spectrum ofp/p ratio is in overall agreement with the secondary production especially below ∼ 100 GeV [4,5], at higher energies, there is a trend of flattening and smooth rise in the range ∼ 100 − 260 GeV, followed by a drop by ∼ 30% in the range ∼ 260 − 450 GeV. Such a hint of a bump-like excess has already been observed in the preliminary AMS-02 result [3], and is strengthened in the latest data with higher statistics.

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“…4 the ε = 10 −10 contour appears for r ∞ = 10 −4 . The method used in setting the constraints from CRESST-II and LUX is given in Appendix B of [93] (also see [52,53,94]). 8 We use a similar method in deriving the constraint for CDMS-LITE, the details of which are given in the appendix.…”

Section: Direct Detectionmentioning

confidence: 99%

“…Direct detection is discussed in Sec. 6 (providing updated constraints to [52,53]). Important caveats regarding the formation of dark atomic bound states and the reannihilation effect are explained in Sec.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric dark matter: residual annihilations and self-interactions

et al. 2018

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Dark matter (DM) coupled to light mediators has been invoked to resolve the putative discrepancies between collisionless cold DM and galactic structure observations. However, γ-ray searches and the CMB strongly constrain such scenarios. To ease the tension, we consider asymmetric DM. We show that, contrary to the common lore, detectable annihilations occur even for large asymmetries, and derive bounds from the CMB, γ-ray, neutrino and antiproton searches. We then identify the viable space for self-interacting DM. Direct detection does not exclude this scenario, but provides a way to test it.

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Direct detection signatures of self-interacting dark matter with a light mediator

Cited by 78 publications

References 78 publications

Composite asymmetric dark matter with a dark photon portal

Composite asymmetric dark matter with a dark photon portal

Antiprotons from dark matter annihilation through light mediators and a possible excess in AMS-02 p¯/p data

Asymmetric dark matter: residual annihilations and self-interactions

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