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Dark anti atoms can explain DAMA

By Quentin Wallemacq and Jean-René Cudell


We show that the existence of a sub-dominant form of dark matter, made of dark 'antiatoms' of a mass of 1 TeV and a size of 30 fm, can explain the results of direct detection experiments, with a positive signal in DAMA/NaI and DAMA/LIBRA and no signal in other experiments. The signal comes from the binding of the dark anti-atoms to thallium, a dopant in DAMA, and is not present for the constituent atoms of other experiments. The dark anti-atoms are made of two particles oppositely charged under a dark U(1) symmetry and can bind to terrestrial atoms because of a kinetic mixing between the photon and the massless dark photon, such that the dark particles acquire an electric milli-charge of ± 5.10(−)(4)e. This millicharge enables them to bind to high-Z atoms via radiative capture, after they thermalize in terrestrial matter through elastic collisions.Peer reviewe

Topics: Composite dark matter, DAMA, Direct searches, Physical, chemical, mathematical & earth Sciences :: Space science, astronomy & astrophysics, Physique, chimie, mathématiques & sciences de la terre :: Aérospatiale, astronomie & astrophysique
Year: 2015
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