More Hints of Dark Matter Cosmic Variance

Is a result of 730 kg times of the CRESST-II Dark Matter Search

G. Angloher, M. Bauer, I. Bavykina, A. Bento, C. Bucci, C. Ciemniak, G. Deuter, F. von Feilitzsch, D. Hauff, P. Huff, C. Isaila, J. Jochum, M. Kiefer, M. Kimmerle, J.-C. Lanfranchi, F. Petricca, S. Pfister, W. Potzel, F. Pr�bst, F. Reindl, S. Roth, K. Rottler, C. Sailer, K. Sch�ffner, J. Schmaler, S. Scholl, W. Seidel, M. von Sivers, L. Stodolsky, C. Strandhagen, R. Strau�, A. Tanzke, I. Usherov, S. Wawoczny, M. Willers, A. Z�ller

The CRESST-II cryogenic Dark Matter search, striving at recognition of WIMPs via elastic scattering off nuclei in CaWO$_4$ deposits, completed 730 kg times of data consuming 2011. We present the information collected with eight detector modules, each having a two-funnel readout one for any phonon signal and also the other for coincidently created scintillation light. The first kind supplies a precise way of measuring the power deposited by an interaction, and the number of scintillation light to deposited energy may be used to discriminate various kinds of interacting contaminants and therefore to tell apart possible signal occasions in the dominant skills. 60-seven occasions are based in the acceptance region in which a WIMP signal as low energy nuclear recoils could be expected. We estimate background contributions for this observation from four sources: 1) leakage in the e/gamma-band 2) leakage in the alpha-particle band 3) neutrons and 4) Pb-206 recoils from Po-210 decay. Utilizing a maximum likelihood analysis, we discover, in a high record significance, these sources alone aren't sufficient to describe the information. Adding an indication because of scattering of relatively light WIMPs could take into account this discrepancy, and that we determine the connected WIMP parameters.

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