The instrument PAMELA, in orbit since June 15th, 2006, on board the Russian satellite Resurs DK1, is daily delivering to ground 16 Gigabytes of data. The apparatus is designed to study charged particles in the cosmic radiation, with a particular focus on antiparticles for searching antimatter and signals of dark matter annihilation. A combination of a magnetic spectrometer and different detectors allows antiparticles to be reliably identified from a large background of other charged particles. New results on the antiproton‐to‐proton and positron‐to‐all electron ratios over a wide energy range (1–100 GeV) are presented. While the antiproton‐to‐proton ratio does not show significant differences from standard secondary production, in the positron‐to‐all electron ratio an enhancement is clearly seen at energies above 10 GeV. Possible interpretations of this effect are briefly discussed.
Dark matter indirect search: The PAMELA experiment / Ricci, M.; Adriani, O.; Barbarino, G.C.; Bazilevskaya, G.A.; Bellotti, R.; Boezio, M.; Bogomolov, E.A.; Bonechi, L.; Bongi, M.; Bonvicini, V.; Bottai, S.; Bruno, A.; Cafagna, F.; Campana, D.; Carlson, P.; Casolino, M.; Castellini, G.; De Pascale, M.P.; De Santis, C.; De Simone, N.; Di Felice, V.; Galper, A.M.; Grishantseva, L.; Hofverberg, P.; Koldashov, S.V.; Krutkov, S.Y.; Kvashnin, A.N.; Leonov, A.; Malvezzi, V.; Marcelli, L.; Menn, W.; Mikhailov, V.V.; Mocchiutti, E.; Osteria, G.; Papini, P.; Pearce, M.; Picozza, P.; Ricciarini, S.B.; Simon, M.; Sparvoli, R.; Spillantini, P.; Stozhkov, Y.I.; Vacchi, A.; Vannuccini, E.; Vasilyev, G.; Voronov, S.A.; Yurkin, Y.T.; Zampa, G.; Zampa, N.; Zverev, V.G.. - ELETTRONICO. - 1200:(2009), pp. 968-972. (Intervento presentato al convegno SUSY09: 7th International Conference on Supersymmetry and the Unification of Fundamental Interactions) [10.1063/1.3327775].
Dark matter indirect search: The PAMELA experiment
ADRIANI, OSCAR;BONGI, MASSIMO;
2009
Abstract
The instrument PAMELA, in orbit since June 15th, 2006, on board the Russian satellite Resurs DK1, is daily delivering to ground 16 Gigabytes of data. The apparatus is designed to study charged particles in the cosmic radiation, with a particular focus on antiparticles for searching antimatter and signals of dark matter annihilation. A combination of a magnetic spectrometer and different detectors allows antiparticles to be reliably identified from a large background of other charged particles. New results on the antiproton‐to‐proton and positron‐to‐all electron ratios over a wide energy range (1–100 GeV) are presented. While the antiproton‐to‐proton ratio does not show significant differences from standard secondary production, in the positron‐to‐all electron ratio an enhancement is clearly seen at energies above 10 GeV. Possible interpretations of this effect are briefly discussed.
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