Revisiting GeV-scale annihilating dark matter with the AMS-02 positron fraction

Krommydas, Iason; Cholis, Ilias

doi:10.1103/physrevd.107.023003

Cited by 5 publications

(3 citation statements)

References 173 publications

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“…The high uncertainties in our estimations of the local positron flux have direct implications in the current searches for dark matter and also in the evaluation of the production of positrons (and electrons) by nearby sources, namely SNRs and PWNs. For what concerns DM searches, there have been a few recent studies using positrons to constrain the annihilation rate of leptophilic dark matter [94,127,128]. Our results indicate that the searches for DM features in the positron spectrum will be highly affected by the astrophysical uncertainties, specially when the signals expected are not sharp, as it is the case of the expected signal from a heavy mass WIMP or the signal generated in the τ τ channel.…”

Section: Discussionmentioning

confidence: 86%

“…In fact, using synthetic data to test the ability of their analysis to spot this kind of features, the authors of ref. [127] pointed out that they were unable to identify masses larger than ∼ 30 GeV in the µµ channel and totally unable to correctly identify any signal generated in the τ τ channel, even though they did not consider reacceleration in their approach, which may significantly affect their results. On top of this, we note that even sharp DM signals may be masked by the emission of more conventional sources of positrons, as PWNs or even SNRs (see ref.…”

Section: Discussionmentioning

confidence: 99%

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The FLUKA cross sections for cosmic-ray leptons and uncertainties on current positron predictions

De La Torre Luque,

Loparco,

Mazziotta

2023

J. Cosmol. Astropart. Phys.

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Cosmic-ray (CR) antiparticles have the potential to reveal signatures of unexpected astrophysical processes and even new physics beyond the Standard Model. Recent CR detectors have provided accurate measurements of the positron flux, revealing the so-called positron excess at high energies. However, the uncertainties related to the modelling of the local positron flux are still very high, significantly affecting our models of positron emission from pulsars and current dark matter searches. In this work, we report a new set of cross sections for positron and electron production derived from the FLUKA code. We compare them with the most extended cross-section data-sets and show the impact of neglecting the positron production from heavy CRs. Then, we review the most significant sources of uncertainties in our current estimations of the secondary positron flux at Earth and examine for the first time the impact of considering the spiral arm structure of the Galaxy in these estimations. Finally, we provide state-of-the-art predictions of the local positron flux and discuss the limitations of our dark matter searches with positrons and difficulties to determine the contribution from pulsars to the positron flux at low energies.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

The FLUKA cross sections for cosmic-ray leptons and uncertainties on current positron predictions

De La Torre Luque,

Loparco,

Mazziotta

2023

J. Cosmol. Astropart. Phys.

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“…We consider this an alternative explanation to be probed by multiwavelength observations. In a separate paper (Krommydas & Cholis 2023), we explore the possible impact these lower-energy features have on dark matter limits. We make publicly available our burst simulations in Cholis & Krommydas (2022a), while our background simulations are available through Cholis & Krommydas (2021, 2022b.…”

Section: Results and Conclusionmentioning

confidence: 99%

Possible Counterpart Signal of the Fermi Bubbles at the Cosmic-Ray Positrons

Cholis

Krommydas

2023

ApJ

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The inner Galaxy has hosted cosmic-ray burst events, including those responsible for the gamma-ray Fermi bubbles and the eROSITA bubbles in X-rays. In this work, we study the Alpha Magnetic Spectrometer positron fraction and find three features around 12, 21, and 48 GeV, of which the lowest energy has a 1.4–4.9σ significance, depending on astrophysical background assumptions. Using background simulations that explain the cosmic-ray positron fraction, positron flux, and electron plus positron flux by primary and secondary cosmic rays and cosmic rays from local pulsars, we test these spectral features as originating from electron/positron burst events from the inner Galaxy. We find the 12 GeV feature to be explained by an event of age τ ≃ 3–10 Myr, in agreement with the proposed age of the Fermi bubbles. Furthermore, the energy in cosmic-ray electrons and positrons propagating along the Galactic disk and not within the Fermi bubbles volume is estimated to be 1051.5–1057.5 erg, or O(10−4) − O(1) the cosmic-ray energy causing the Fermi bubbles. We advocate that these positron fraction features are the counterpart signals of the Fermi bubbles, or of substructures within them, or of the eROSITA bubbles.

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Enhancement of p-wave dark matter annihilation by quasi-bound states

Beneke,

Binder,

De Ros

et al. 2024

J. High Energ. Phys.

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We scrutinize the Sommerfeld enhancement in dark matter pair annihilation for p-wave and higher-ℓ partial waves. For the Yukawa potential these feature a super-resonant Breit-Wigner peak in their velocity-dependence close to Sommerfeld resonances as well as a universal scaling with velocity for all ℓ ≥ 1 that differs from the s-wave case. We provide a quantum mechanical explanation for these phenomena in terms of quasi-bound states sustained by the centrifugal barrier of the partial-wave potential, and give approximate WKB expressions capturing the main effects. The impact of quasi-bound states is exemplified for wino dark matter and models with light mediators, with a focus on indirect detection signals. We note that quasi-bound states can also explain similar peaks in the bound-state formation and self-scattering cross sections.

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Revisiting GeV-scale annihilating dark matter with the AMS-02 positron fraction

Cited by 5 publications

References 173 publications

The FLUKA cross sections for cosmic-ray leptons and uncertainties on current positron predictions

The FLUKA cross sections for cosmic-ray leptons and uncertainties on current positron predictions

Possible Counterpart Signal of the Fermi Bubbles at the Cosmic-Ray Positrons

Enhancement of p-wave dark matter annihilation by quasi-bound states

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