%0 Journal Article %T Direct constraints on diffusion models from cosmic-ray positron data: Excluding the MIN model for dark matter searches %+ Centre de Physique des Particules de Marseille (CPPM) %+ Laboratoire de Physique Subatomique et de Cosmologie (LPSC) %+ Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH) %A Lavalle, Julien %A Maurin, David %A Putze, Antje %< avec comité de lecture %Z LAPTH-054/14 %@ 2470-0010 %J Physical Review D %I American Physical Society %V 90 %P 081301 %8 2014 %D 2014 %Z 1407.2540 %R 10.1103/PhysRevD.90.081301 %Z Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Journal articles %X Galactic Cosmic-ray (CR) transport parameters are usually constrained by theboron-to-carbon ratio. This procedure is generically plagued with degeneraciesbetween the diffusion coefficient and the vertical extent of the Galacticmagnetic halo. The latter is of paramount importance for indirect dark matter(DM) searches, because it fixes the amount of DM annihilation or decay thatcontributes to the local antimatter CR flux. These degeneracies could be brokenby using secondary radioactive species, but the current data still have largeerror bars, and this method is extremely sensitive to the very localinterstellar medium (ISM) properties. Here, we propose to use the low-energy CRpositrons in the GeV range as another direct constraint on diffusion models. Weshow that the PAMELA data disfavor small diffusion halo ($L\lesssim 3$ kpc) andlarge diffusion slope models, and exclude the minimal ({\em min}) configuration(Maurin et al. 2001, Donato et al. 2004) widely used in the literature tobracket the uncertainties in the DM signal predictions. This is complementaryto indirect constraints (diffuse radio and gamma-ray emissions) and has strongimpact on DM searches. Indeed this makes the antiproton constraints more robustwhile enhancing the discovery/exclusion potential of current and futureexperiments, like AMS-02 and GAPS, especially in the antiproton andantideuteron channels. %G English %2 https://hal.science/hal-01021892v1/document %2 https://hal.science/hal-01021892v1/file/letter.pdf %L hal-01021892 %U https://hal.science/hal-01021892 %~ IN2P3 %~ UNIV-SAVOIE %~ UGA %~ CPPM %~ LPSC %~ CNRS %~ UNIV-GRENOBLE1 %~ UNIV-AMU %~ INPG %~ LAPTH %~ USMB-COMUE %~ TEST-SEBASTIEN3