DAMA annual modulation and mirror Dark Matter
  The DAMA experiment using ultra low background NaI(Tl) crystal scintillators
has measured an annual modulation effect in the keV region which satisfies all
the peculiarities of an effect induced by Dark Matter particles. In this paper
we analyze this annual modulation effect in terms of mirror Dark Matter, an
exact duplicate of ordinary matter from parallel hidden sector, which chemical
composition is dominated by mirror helium while it can also contain significant
fractions of heavier elements as Carbon and Oxygen. Dark mirror atoms are
considered to interact with the target nuclei in the detector via
Rutherford-like scattering induced by kinetic mixing between mirror and
ordinary photons, both being massless. In the present analysis we consider
various possible scenarios for the mirror matter chemical composition. For all
the scenarios, the relevant ranges for the kinetic mixing parameter have been
obtained taking also into account various existing uncertainties in nuclear and
particle physics quantities.
