Abstract
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 M w =(52 +10 −8) GeV and ξσ p =(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 v 0 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 ξσ p 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, M w =(44 +12 −9) GeV and ξσ p =(5.4±1.0)·10 −6 pb at ≃4 σ C.L.). The 3 σ C.L. allowed regions in the ξσ p , M w plane summarize the obtained main physical results.
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