Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Determination of the WIMP Mass

Details Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Determination of the WIMP Mass Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Determination of the WIMP Mass

2010-03-27

arxiv.org/abs/1003.5277v2

JCAP 1008:014,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 22 eps figures; v2: revised version for publication, references added and updated

Scientific paper

10.1088/1475-7516/2010/08/014

In the earlier work on the development of a model-independent data analysis method for determining the mass of Weakly Interacting Massive Particles (WIMPs) by using measured recoil energies from direct Dark Matter detection experiments directly, 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, we take into account a fraction of possible residue background events, which pass all discrimination criteria and then mix with other real WIMP-induced events in our data sets. Our simulations show that, for the determination of the WIMP mass, the maximal acceptable fraction of residue background events in the analyzed data sets of O(50) total events is ~20%, for background windows of the entire experimental possible energy ranges, or in low energy ranges; while, for background windows in relatively higher energy ranges, this maximal acceptable fraction of residue background events can not be larger than ~10%. For a WIMP mass of 100 GeV with 20% background events in the windows of the entire experimental possible energy ranges, the reconstructed WIMP mass and the 1-sigma statistical uncertainty are ~97 GeV^{+61%}_{-35%} (~94 GeV^{+55%}_{-33%} for background-free data sets).

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