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In our earlier work on the development of a model-independent data analysismethod for reconstructing the (moments of the) time-averaged one-dimensionalvelocity distribution function of Weakly Interacting Massive Particles (WIMPs)by using measured recoil energies from direct Dark Matter detection experimentsdirectly, it was assumed that the analyzed data sets are background-free, i.e.,all events are WIMP signals. In this article, as a more realistic study, wetake into account a fraction of possible residue background events, which passall discrimination criteria and then mix with other real WIMP-induced events inour data sets. Our simulations show that, for the reconstruction of theone-dimensional WIMP velocity distribution, the maximal acceptable fraction ofresidue background events in the analyzed data set(s) of O(500) total events is~10% - 20%. For a WIMP mass of 50 GeV with a negligible uncertainty and 20%residue background events, the deviation of the reconstructed velocitydistribution would in principle be ~7.5% with a statistical uncertainty of ~18%(~19% for a background-free data set).

journal of cosmology and astroparticle physics

Effects of Residue Background Events in Direct Dark Matter Detection  Experiments on the Reconstruction of the Velocity Distribution Function of  Halo WIMPs