The PAMELA Space Mission for Antimatter and Dark Matter Searches in Cosmic Rays

Adriani, O.; Barbarino, G. C.; Bazilevskaja, G. A.; Bellotti, R.; Boezio, M.; Bogomolov, É. A.; Bonechi, L.; Bongi, M.; Bonvicini, V.; Борисов, С. В.; Bottai, S.; Bruno, A.; Cafagna, F.; Campana, D.; Carbone, R.; Carlson, P.; Casolino, M.; Castellini, G.; Consiglio, L.; Pascale, M. P. De; Santis, C. De; Simone, Nicola de; Felice, V. Di; Galper, A. M.; Hofverberg, P.; Koldashov, S. V.; Krutkov, S. Y.; Kvashnin, A. N.; Leonov, A.; Malvezzi, V.; Marcelli, L.; Menn, W.; Mikhailov, V. V.; Mocchiutti, E.; Mori, N.; Nikonov, N.; Osteria, G.; Papini, P.; Pearce, Mark; Picozza, P.; Ricci, M.; Ricciarini, S.; Simon, M.; Sparvoli, R.; Спиллантини, П.; Stozhkov, Y. I.; Vacchi, A.; Vannuccini, E.; Vasilyev, G.; Voronov, S. A.; Yurkin, Y. T.; Zampa, G.; Zampa, N.; Zverev, V. G.

doi:10.1063/1.3395994

Cited by 42 publications

(66 citation statements)

References 2 publications

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“…The constitution of the cosmic ray (CR) can always tell us a lot about our Galaxy and our universe. Recently, the AMS-02 collaboration has published the first measurement of the positron fraction e + /(e − + e + ) in CR with a high precision, which shows a continuous rise from 5 up to 350 GeV [1] and confirms the general behavior previously measured by CAPRICE [2], HEAT [3,4], AMS-01 [5], PAMELA [6,7] and Fermi-LAT [8]. The observed uprise is in stark contrast with the conventional expectations based on the secondary-origin positrons, whose fraction is just monotonically decreasing with energy.…”

Section: Introductionsupporting

confidence: 67%

Imprint of multicomponent dark matter on AMS-02

Geng¹,

Huang²,

Tsai³

2014

Phys. Rev. D

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The multi-component decaying dark matter (DM) scenario is investigated to explain the possible excesses in the positron fraction by PAMELA and recently confirmed by AMS-02, and in the total e + + e − flux observed by Fermi-LAT. By performing the χ 2 fits, we find that two DM components are already enough to give a reasonable fit of both AMS-02 and Fermi-LAT data. The best-fitted results show that the heavier DM component with its mass 1.5 TeV dominantly decays through the µ-channel, while the lighter one of 100 GeV mainly through the τ -channel. As a byproduct, the fine structure around 100 GeV observed by AMS-02 and Fermi-LAT can be naturally explained by the dropping due to the lighter DM component. With the obtained model parameters by the fitting, we calculate the diffuse γ-ray emission spectrum in this two-component DM scenario, and find that it is consistent with the data measured by Fermi-LAT. We also construct a microscopic particle DM model to naturally realize the two-component DM scenario, and point out an interesting neutrino signal which is possible to be measured in the near future by IceCube.a geng@phys

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Section: Introductionsupporting

confidence: 67%

Imprint of multicomponent dark matter on AMS-02

Geng¹,

Huang²,

Tsai³

2014

Phys. Rev. D

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“…For this we use the force field approximation. The currently most accurate measurements of the antiproton flux were performed by the PAMELA [51] and the BESS-Polar II [52] collaborations. Both data sets were obtained in a period of low solar activity, where a force field of φ = 500 − 600 MV can be used to account for modulation [36].…”

Section: Prediction For the Antiproton Flux And Comparison With Datamentioning

confidence: 99%

The cosmic ray antiproton background for AMS-02

Kappl¹,

Winkler²

2014

J. Cosmol. Astropart. Phys.

159

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The AMS-02 experiment is measuring the cosmic ray antiproton flux with high precision. The interpretation of the upcoming data requires a thorough understanding of the secondary antiproton background. In this work, we employ newly available data of the NA49 experiment at CERN, in order to recalculate the antiproton source term arising from cosmic ray spallations on the interstellar matter. We systematically account for the production of antiprotons via hyperon decay and discuss the possible impact of isospin effects on antineutron production. A detailed comparison of our calculation with the existing literature as well as with Monte Carlo based evaluations of the antiproton source term is provided. Our most important result is an updated prediction for the secondary antiproton flux which includes a realistic assessment of the particle physics uncertainties at all energies.

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“…Additional motivation could be provided by various cosmic ray anomalies. For instance, attempts to explain the cosmic ray positron excess observed by PAMELA [19,20], Fermi-LAT [21] and AMS-02 [22] in terms of DM annihilation typically require a leptophilic DM model [23][24][25][26][27][28][29][30][31][32] in order not to exceed the measured antiproton flux [33,34]. Finally, it is intriguing that the possible anomalies in the gamma ray signal from the Galactic Center [35][36][37], in the gamma ray emission from the Fermi Bubbles [38][39][40][41], and in radio signals from filamentary structures in the inner galaxy [42] could be explained in leptophilic DM models.…”

Section: Introductionmentioning

confidence: 99%

Loopy constraints on leptophilic dark matter and internal bremsstrahlung

Michaels

Smirnov

2014

J. Cosmol. Astropart. Phys.

110

133

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A sharp and spatially extended peak in an astrophysical gamma ray spectrum would provide very strong evidence for the existence of dark matter (DM), given that there are no known astrophysical processes that could mimic such a signal. From the particle physics perspective, perhaps the simplest explanation for a gamma ray peak is internal bremsstrahlung in DM annihilation through a charged t-channel mediator η close in mass to the DM particle χ. Since DM annihilation to quarks is already tightly constrained in this scenario, we focus here on the leptophilic case. We compute the electromagnetic anapole and dipole moments that DM acquires at 1-loop, and we find an interesting enhancement of these moments if the DM particle and the mediator are close in mass. We constrain the DM anapole and dipole moments using direct detection data, and then translate these limits into bounds on the DM annihilation cross section. Our bounds are highly competitive with those from astrophysical gamma ray searches. In the second part of the paper, we derive complementary constraints on internal bremsstrahlung in DM annihilation using LEP mono-photon data, measurements of the anomalous magnetic moments of the electron and the muon, and searches for lepton flavor violation. We also comment on the impact of the internal bremsstrahlung scenario on the hyperfine splitting of true muonium.

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The PAMELA Space Mission for Antimatter and Dark Matter Searches in Cosmic Rays

Cited by 42 publications

References 2 publications

Imprint of multicomponent dark matter on AMS-02

Imprint of multicomponent dark matter on AMS-02

The cosmic ray antiproton background for AMS-02

Loopy constraints on leptophilic dark matter and internal bremsstrahlung

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