  The annihilation of dark matter particles in the galactic halo of the Milky
Way may lead to cosmic ray signatures that can be probed by the AMS-02
experiment, which has measured the composition and fluxes of charged cosmic
rays with unprecedented precision. Given the absence of characteristic spectral
features in the electron and positron fluxes measured by AMS-02, we derive
upper limits on the dark matter annihilation cross section for leptophilic dark
matter models. Our limits are based on a new background model that describes
all recent measurements of the energy spectra of cosmic ray positrons and
electrons. For thermal dark matter relics, we can exclude dark matter masses
below about 100 GeV. We include the radiation of electroweak gauge bosons in
the dark matter annihilation process and compute the antiproton signal that can
be expected within leptophilic dark matter models.
