Few arguments on comparisons with some model dependent results

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  • For example, large differences are expected in the counting rate for instance among nuclei fully sensitive to the SD interaction (as 23Na and 127I) with the respect to nuclei largely insensitive to such a coupling (as e.g natGe, natSi, natAr, natCa, natW, natO) and also when nuclei in principle all sensitive to this coupling but having different unpaired nucleon (e.g. neutron in case of the odd spin nuclei, such as 129Xe, 131Xe, 125Te, 73Ge, 29Si, 183W and proton in the 23Na and 127I). In addition, the very large existing uncertainties on e.g. form factors, spin factors, etc. for each nuclides always largely decouple results.
  • In case the detection of the DM particles would involve electromagnetic signals (see, for example, the case of the light bosons discussed above), all the experiments, such as e.g. CDMS, EDELWEISS, CREST, ZEPLIN, WARP, XENON do lose the DM signal in the rejection procedures of the e.m. contribution to the counting rate.

  • It is also worth to note that no results obtained with different target nuclei can intrinsecally be directly compared even for the same kind of coupling. In fact, this requires -- among others -- the knowledge of the scaling laws among the DM particle-nuclear cross sections, situation even worse than that in the field of double beta decay experiments when different materials are used.
  • As regards the indirect searches, a comparison would always require the calculation and the consideration of all the possible DM particle configurations in the given particle model, since it does not exist a biunivocal correspondence between the observables in the two kinds of experiments: DM particle-nucleus elastic scattering cross section (direct detection case) and flux of either muons from secondary neutrinos or antimatter or photons following DM annihilations (indirect detection cases).