Upper limit on the antihelium flux in primary cosmic rays

Mayorov, A. G.; Galper, A. M.; Adriani, O.; Bazilevskaya, G. A.; Barbarino, G. C.; Bellotti, R.; Boezio, M.; Bogomolov, É. A.; Bonvicini, V.; Bongi, M.; Bonechi, L.; Борисов, С. В.; Bottai, S.; Bruno, A.; Vacci, S.; Vannuccini, E.; Vasiliev, G. I.; Voronov, S. A.; Wu, Yunfei; Danilchenko, I. A.; Gillard, W.; Jerse, G.; Zampa, G.; Zampa, N.; Zverev, V. G.; Casolino, M.; Campana, D.; Carbone, R.; Karelin, A. V.; Carlson, P.; Castellini, G.; Cafagna, F.; Kvashnin, A. N.; Koldashov, S. V.; Koldobsky, S. A.; Krutkov, S. Y.; Leonov, A.; Malakhov, V.; Malvezzi, V.; Marcelli, L.; Menn, W.; Mikhailov, V. V.; Mocchiutti, E.; Mori, N.; Nikonov, N.; Osteria, G.; Pizzolotto, S.; Papini, P.; Pascale, M. P. De; Picozza, P.; Pearce, Mark; Ricci, M.; Ricciarini, S.; Runtso, M. F.; Simon, M.; Simone, N. De; Sparvoli, R.; Спиллантини, П.; Stozhkov, Y. I.; Felice, V. Di; Yurkin, Y. T.

doi:10.1134/s0021364011110087

Cited by 20 publications

(7 citation statements)

References 12 publications

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“…The projected sensitivity of AMS-02 after 5 years of operation is shown by the light green region. The gray regions correspond to the bounds imposed by previous BESS [114], PAMELA [115], and AMS-01 [116] measurements (the helium flux from PAMELA was used to translate from the He/He results given in these references). The dark matter density profile is Einasto.…”

Section: Prospects For Dark Matter Detection With Antiheliummentioning

confidence: 99%

Review of the theoretical and experimental status of dark matter identification with cosmic-ray antideuterons

et al. 2016

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See paper for full list of authors - 67 pages, 20 figures; submitted to Physics ReportsInternational audienceRecent years have seen increased theoretical and experimental effort towards the first-ever detection of cosmic-ray antideuterons, in particular as an indirect signature of dark matter annihilation or decay. In contrast to indirect dark matter searches using positrons, antiprotons, or gamma-rays, which suffer from relatively high and uncertain astrophysical backgrounds, searches with antideuterons benefit from very suppressed conventional backgrounds, offering a potential breakthrough in unexplored phase space for dark matter. This article is based on the first dedicated cosmic-ray antideuteron workshop, which was held at UCLA in June 2014. It reviews broad classes of dark matter candidates that result in detectable cosmic-ray antideuteron fluxes, as well as the status and prospects of current experimental searches. The coalescence model of antideuteron production and the influence of antideuteron measurements at particle colliders are discussed. This is followed by a review of the modeling of antideuteron propagation through the magnetic fields, plasma currents, and molecular material of our Galaxy, the solar system, the Earth's geomagnetic field, and the atmosphere. Finally, the three ongoing or planned experiments that are sensitive to cosmic-ray antideuterons, BESS, AMS-02, and GAPS, are detailed. As cosmic-ray antideuteron detection is a rare event search, multiple experiments with orthogonal techniques and backgrounds are essential. Many theoretical and experimental groups have contributed to these studies over the last decade, this review aims to provide the first coherent discussion of the relevant dark matter theories that antideuterons probe, the challenges to predictions and interpretations of antideuteron signals, and the experimental efforts toward cosmic antideuteron detection

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Section: Prospects For Dark Matter Detection With Antiheliummentioning

confidence: 99%

Review of the theoretical and experimental status of dark matter identification with cosmic-ray antideuterons

et al. 2016

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“…We show in grey the areas currently excluded by the experiments which have looked for a flux of anti-He in cosmic rays: Ams-01 [33], Bess [34] and Pamela [35]. Since all these experimental results are given in terms of He/He ratios, we convert them into anti-He fluxes using the He flux measured by Pamela [36] 2 (Ams-02 has also released preliminary data [37], that we do not use).…”

Section: Jhep08(2014)009mentioning

confidence: 99%

Anti-helium from dark matter annihilations

Cirelli

Fornengo

Taoso

et al. 2014

J. High Energ. Phys.

112

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Galactic Dark Matter (DM) annihilations can produce cosmic-ray anti-nuclei via the nuclear coalescence of the anti-protons and anti-neutrons originated directly from the annihilation process. Since anti-deuterons have been shown to offer a distinctive DM signal, with potentially good prospects for detection in large portions of the DM-particle parameter space, we explore here the production of heavier anti-nuclei, specifically antihelium. Even more than for anti-deuterons, the DM-produced anti-He flux can be mostly prominent over the astrophysical anti-He background at low kinetic energies, typically below 3-5 GeV/n. However, the larger number of anti-nucleons involved in the formation process makes the anti-He flux extremely small. We therefore explore, for a few DM benchmark cases, whether the yield is sufficient to allow for anti-He detection in currentgeneration experiments, such as Ams-02. We account for the uncertainties due to the propagation in the Galaxy and to the uncertain details of the coalescence process, and we consider the constraints already imposed by anti-proton searches. We find that only for very optimistic configurations might it be possible to achieve detection with current generation detectors. We estimate that, in more realistic configurations, an increase in experimental sensitivity at low kinetic energies of about a factor of 500-1000 would allow to start probing DM through the rare cosmic anti-He production.

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“…PAMELA (Italian-Russian space mission): Payload for Antimatter Matter Exploration and Lightnuclei Astrophysics. Their bound is somewhat less restrictive: He/He < 4.7 • 10 −7 [14] . Presumably it may be improved by an order of magnitude.…”

Section: Search For Cosmic Antinucleimentioning

confidence: 99%