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

Ž . Data, collected by the ,100 kg NaI Tl DAMA set-up at the Gran Sasso National Laboratory of I.N.F.N. during two Ž . further yearly cycles DAMArNaI-3 and DAMArNaI-4; statistics of 38475 kgPday , have been analysed in terms of WIMP annual modulation signature. The results agree with those previously achieved. The cumulative analysis of all the Ž . available data DAMArNaI-1 to 4; statistics of 57986 kgPday favours the possible presence of a WIMP with Ž q10. Ž q0.4. y6 M s 52 GeV and js s 7.2 P10 pb at 4 s C.L., when standard astrophysical assumptions are considered. w y8 p y0.9 Ž . The allowed mass extends up to 105 GeV 1 s when the uncertainty on the mean value of the local velocity Õ is taken 0 Ž . into account and up to 132 GeV 1 s in case a possible bulk halo rotation is taken into account. Moreover, the allowed regions extend to lower js values when the upper limits on the recoil differential counting rate obtained from p Ž Ž q12 . DAMArNaI-0 is included in the cumulative analysis favouring, in case of standard assumptions, M s 44 GeV and w y9 Ž . y6 . js s 5.4"1.0 P10 pb at ,4 s C.L. . The 3 s C.L. allowed regions in the js , M plane summarize the obtained p p w main physical results. q 2000 Elsevier Science B.V. All rights reserved.