Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Estimation of the Spin-Independent WIMP-Nucleon Coupling
arXiv:1103.4049
Abstract
In our work on the development of a model-independent data analysis method for estimating the spin-independent (SI) scalar coupling of Weakly Interacting Massive Particles (WIMPs) on nucleons 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 estimation of the SI WIMP-nucleon coupling, the maximal acceptable fraction of residue background events in the analyzed data set of O(50) total events is ~ 10% - 20%. For a WIMP mass of 100 GeV and 20% residue background events, the systematic deviation of the reconstructed SI WIMP coupling (with a reconstructed WIMP mass) would in principle be ~ +13% with a statistical uncertainty of ~ ^{+21%}_{-14%} (~ -3.3%^{+18%}_{-13%} for background-free data sets).
31 pages, 22 eps figures; v2: typos fixed, references updated, revised version
References in corpus (7)
- Determining the WIMP mass using direct detection experiments
- Determining the WIMP mass using the complementarity between direct and indirect searches and the ILC
- The Dark Matter Density in the Solar Neighborhood reconsidered
- Estimating the Spin-Independent WIMP-Nucleon Coupling from Direct Dark Matter Detection Data
- Direct Detection of Cold Dark Matter
- Direct Dark Matter Searches and the EDELWEISS-II Experiment
- Uploading User-Defined Functions onto the AMIDAS Website
Cited by in corpus (5)
- Thermal and non-thermal production of dark matter via Z'-portal(s)
- Estimating the Spin-Independent WIMP-Nucleon Coupling from Direct Dark Matter Detection Data
- Effects of Residue Background Events in Direct Dark Matter Detection Experiments on the Determinations of Ratios of WIMP-Nucleon Cross Sections
- AMIDAS-II: Upgrade of the AMIDAS Package and Website for Direct Dark Matter Detection Experiments and Phenomenology
- Background effects on reconstructed WIMP couplings