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We construct a thermal dark matter model with annihilation mediated by aresonance to explain the positron excess observed by PAMELA, Fermi-LAT andAMS-02, while satisfying constraints from cosmic microwave background (CMB)measurements. The challenging requirement is that the resonance has twice thedark matter mass to one part in a million. We achieve this by introducing an$SU(3)_f$ dark flavor symmetry that is spontaneously broken to $SU(2)_f \timesU(1)_f$. The resonance is the heaviest state in the dark matter flavormultiplet and the required mass relation is protected by the vacuum structureand supersymmetry from radiative corrections. The pseudo-Nambu Goldstone Bosons(PNGB's) from the dark flavor symmetry breaking can be slightly lighter thanone GeV and dominantly decay into two muons just from kinematics, withsubsequent decay into positrons. The PNGB's are produced in resonant darkmatter semi-annihilation, where two dark matter particles annihilate into ananti-dark matter particle and a PNGB. The dark matter mass in our model isconstrained to be below around 1.9 TeV from fitting thermal relic abundance,AMS-02 data and CMB constraints. The superpartners of Standard Model (SM)particles can cascade decay into a light PNGB along with SM particles, yieldinga correlated signal of this model at colliders. One of the interestingsignatures is a resonance of a SM Higgs boson plus two collimated muons, whichhas superb discovery potential at LHC Run 2.

Supersymmetric Resonant Dark Matter: a Thermal Model for the AMS-02 Positron Excess