AMS-02 antiprotons reloaded

Kappl, Reinhard; Reinert, Annika; Winkler, Martin Wolfgang

doi:10.1088/1475-7516/2015/10/034

Cited by 73 publications

(94 citation statements)

References 62 publications

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“…The diffusion reacceleration scenario is found to be best consistent with the data of B/C and proton. The failure of non-reacceleration models implies that the presence of convective winds in the galaxy is physically speculative [31,56]. We thus work in the diffusion reacceleration framework for the cosmic ray propagation as specified before.…”

Section: Jhep01(2018)151mentioning

confidence: 99%

Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

2018

J. High Energ. Phys.

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Abstract:We perform an analysis of the simplified dark matter models in the light of cosmic ray observables by AMS-02 and Fermi-LAT. We assume fermion, scalar or vector dark matter particle with a leptophobic spin-0 mediator that couples only to Standard Model quarks and dark matter via scalar and/or pseudo-scalar bilinear. The propagation and injection parameters of cosmic rays are determined by the observed fluxes of nuclei from AMS-02. We find that the AMS-02 observations are consistent with the dark matter framework within the uncertainties. The AMS-02 antiproton data prefer 30 (50) GeV -5 TeV dark matter mass and require an effective annihilation cross section in the region of 4 × 10 −27 (7 × 10 −27 ) -4 × 10 −24 cm 3 /s for the simplified fermion (scalar and vector) dark matter models. The cross sections below 2 × 10 −26 cm 3 /s can evade the constraint from Fermi-LAT dwarf galaxies for about 100 GeV dark matter mass.

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Section: Jhep01(2018)151mentioning

confidence: 99%

Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

2018

J. High Energ. Phys.

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“…Notice however that the fiducial prediction is based on the Med cosmic ray propagation model which has been derived from old B/C data. Forthcoming measurements of the B/C ratio may well induce a shift of the background region upward, as the analysis by [23] seems to indicate.…”

Section: Antiprotons -Has Dark Matter Been Discovered ?mentioning

confidence: 98%

Indirect Dark Matter Searches in the Light of the Recent Ams-02 Observations

Salati

2017

Particle Physics at the Year of Light

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Abstract. If the astronomical dark matter is made of weakly interacting, massive and stable species, it should annihilate on itself into particles. This process should produce rare antimatter cosmic rays and lead to distortions in their energy distributions. The AMS-02 spectrometer has been measuring them with unprecedented accuracy. It is timely to investigate if anomalies have been found in the positron and antiproton spectra and if so, if they indirectly point toward the presence of DM particles annihilating inside the Milky Way.1 Cosmic rays as an indirect probe for dark matterThe universe contains a substantial fraction of its mass under the form of the so-called astronomical dark matter (DM), a pressureless component found inside galaxies [1,2], clusters of galaxies [3] and on cosmological scales. The recent observations of the Planck satellite [4] have confirmed the picture of a flat universe filled with dark energy (68.3%), dark matter (26.8%) and baryons (4.9%). According to this standard lore, the astronomical dark matter cannot be made of baryons and its nature is still unknown. Many solutions have been proposed for the last three decades. Among the numerous possibilities, a particular candidate under the form of a weakly interacting massive particle dubbed WIMP has attracted much attention. This species is naturally present in most extensions of the standard model of particle physics. It is stable by conservation of a quantum number, such as R-parity in supersymmetry or the momentum along the extra-dimensions in Kaluza-Klein inspired models. It interacts with its surroundings and annihilates on itself through typically weak interactions. The crucial consequence, that makes WIMPs so interesting, is that they are produced during the Big Bang with a relic abundance close to the Planck value of Ω DM h 2 = 0.1196 ± 0.0031. For this to happen, the annihilation cross section σv should be close to the canonical value of 3 × 10 −26 cm 3 s −1 . The searches for WIMP-like DM have developed along three directions. First, WIMPs could be produced at colliders such as the LHC and appear in missing energy events. An abnormally large rate of gluon monojets or single gauge boson events could be explained by the fusion of quark-antiquark pairs into pairs of DM particles. A second line of research, called direct detection, is based on the potential collisions of WIMPs on a terrestrial instrument. As an impinging a

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“…Finally we note that the whole question of propagation models has acquired new relevance in the context of recent searches for possible signals of dark matter in cosmic rays, see e.g. [5] and references therein.…”

Section: Introductionmentioning

confidence: 97%

Cosmic-ray diffusive reacceleration: a critical look

Drury¹,

Strong²

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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Cosmic-ray scattering on magnetic turbulence leads to spatial diffusive propagation; if the scattering medium is moving, this will inevitably also cause changes in the momentum of the particles, so-called diffusive reacceleration. This can be described as diffusion in momentum space. Diffusive reacceleration has often been invoked to explain the peak observed in secondary-to-primary ratios at a few GeV, in particular Boron-to-Carbon. This avoids the necessity to postulate an ad-hoc break in the spatial diffusive coefficient, and has become almost a standard in modelling cosmic-ray spectra. However, at the levels invoked, the process implies a significant input of energy from the interstellar medium into cosmic rays, so that in such models interstellar space competes with the usual accelerators like supernova remnants. The questions arise: is reacceleration really occurring at the high level required to explain secondary-to-primary ratios? and are the energy requirements physically plausible? We address this issue using both analytical and numerical models of cosmic-ray propagation.

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AMS-02 antiprotons reloaded

Cited by 73 publications

References 62 publications

Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

Revisiting simplified dark matter models in terms of AMS-02 and Fermi-LAT

Indirect Dark Matter Searches in the Light of the Recent Ams-02 Observations

Cosmic-ray diffusive reacceleration: a critical look

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