Search for WIMP annual modulation signature: results from DAMA/NaI-3 and DAMA/NaI-4 and the global combined analysis

Details Search for WIMP annual modulation signature: results from DAMA/NaI-3 and DAMA/NaI-4 and the global combined analysis Search for WIMP annual modulation signature: results from DAMA/NaI-3 and DAMA/NaI-4 and the global combined analysis

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phlb..480...23b&link_type=abstract

Physics Letters B, Volume 480, Issue 1-2, p. 23-31.

Physics

332

Scientific paper

Data, collected by the /~=100 kg NaI(Tl) DAMA set-up at the Gran Sasso National Laboratory of I.N.F.N. during two further yearly cycles (DAMA/NaI-3 and DAMA/NaI-4; statistics of 38475 kg/.day), have been analysed in terms of WIMP annual modulation signature. The results agree with those previously achieved. The cumulative analysis of all the available data (DAMA/NaI-1 to 4; statistics of 57986 kg/.day) favours the possible presence of a WIMP with Mw=(52+10-8) GeV and ξσp=(7.2+0.4- 0.9).10-6 pb at 4 /σ C.L., when standard astrophysical assumptions are considered. The allowed mass extends up to 105 GeV (1 /σ) when the uncertainty on the mean value of the local velocity v0 is taken into account and up to 132 GeV (1 /σ) in case a possible bulk halo rotation is taken into account. Moreover, the allowed regions extend to lower ξσp values when the upper limits on the recoil differential counting rate obtained from DAMA/NaI-0 is included in the cumulative analysis (favouring, in case of standard assumptions, Mw=(44+12-9) GeV and ξσp=(5.4+/-1.0).10-6 pb at /~=4 /σ C.L.). The 3 /σ C.L. allowed regions in the ξσp, Mw plane summarize the obtained main physical results.

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