Effect of the galactic halo modeling on the DAMANaI annual modulation result: An extended analysis of the data for weakly interacting massive particles with a purely spinindependent coupling
Abstract
The DAMANaI Collaboration has observed a 4σ C.L. modelindependent effect investigating the annual modulation signature in the counting rate of an NaI(Tl) setup (total exposure of 57986 kg day) and the implications of this effect have been studied under different modeldependent assumptions. In this paper we extend one of the previous analyses, the case of a WIMP with a purely spinindependent coupling, by discussing in detail the implications on the results of the uncertainties on the dark matter galactic velocity distribution. We study in a systematic way possible departures from the isothermal sphere model, which is the parametrization usually adopted to describe the halo. We specifically consider modifications arising from various matter density profiles, effects due to anisotropies of the velocity dispersion tensor and rotation of the galactic halo. The hypothesis of WIMP annual modulation, already favored in the previous analysis using an isothermal sphere, is confirmed in all the investigated scenarios, and the effects of the different halo models on the determination of the allowed maximumlikelihood region in the WIMP mass and WIMPnucleon cross section are derived and discussed.
 Publication:

Physical Review D
 Pub Date:
 August 2002
 DOI:
 10.1103/PhysRevD.66.043503
 arXiv:
 arXiv:hepph/0203242
 Bibcode:
 2002PhRvD..66d3503B
 Keywords:

 95.35.+d;
 98.35.Gi;
 98.62.Gq;
 Dark matter;
 Galactic halo;
 Galactic halos;
 High Energy Physics  Phenomenology;
 Astrophysics;
 High Energy Physics  Experiment
 EPrint:
 42 pages, 3 tables and 37 figures, typeset with ReVTeX4. A few typos corrected. The revised version matches the paper to appear in PRD. The paper may also be found at http://www.to.infn.it/~fornengo/papers/dama_distrib.ps.gz