/ astro-ph.CO arXiv:1603.05120


Constraints on low-mass WIMPs from the EDELWEISS-III dark matter search


Armengaud, E. (DAPNIA, Saclay) ; Arnaud, Q. (Lyon, IPN) ; Augier, C. (Lyon, IPN) ; Benoit, A. (Lyon, IPN) ; Benoit, A. (Grenoble U., UFR Math.) ; Berge, L. (Orsay) ; Bergmann, T. (Karlsruhe, Inst. Technol.) ; Billard, J. (Lyon, IPN) ; Blumer, J. (Karlsruhe, Inst. Technol.) ; de Boissiere, T. (DAPNIA, Saclay) ; Bres, G. (Grenoble U., UFR Math.) ; Broniatowski, A. (Orsay) ; Brudanin, V. (Dubna, JINR) ; Camus, P. (Grenoble U., UFR Math.) ; Cazes, A. (Lyon, IPN) ; Chapellier, M. (Orsay) ; Charlieux, F. (Lyon, IPN) ; Dumoulin, L. (Orsay) ; Eitel, K. (Karlsruhe, Inst. Technol.) ; Filosofov, D. (Dubna, JINR) ; Foerster, N. (Karlsruhe U., EKP) ; Fourches, N. (DAPNIA, Saclay) ; Garde, G. (Grenoble U., UFR Math.) ; Gascon, J. (Lyon, IPN) ; Gerbier, G. (DAPNIA, Saclay) ; Giuliani, A. (Orsay) ; Grollier, M. (Grenoble U., UFR Math.) ; Gros, M. (DAPNIA, Saclay) ; Hehn, L. (Karlsruhe, Inst. Technol.) ; Herve, S. (DAPNIA, Saclay) ; Heuermann, G. (Karlsruhe U., EKP) ; Humbert, V. (Orsay) ; De Jesus, M. (Lyon, IPN) ; Jin, Y. (Unlisted, FR) ; Jokisch, S. (Karlsruhe, Inst. Technol.) ; Juillard, A. (Lyon, IPN) ; Kefelian, C. (Karlsruhe U., EKP) ; Kleifges, M. (Karlsruhe, Inst. Technol.) ; Kozlov, V. (Karlsruhe, Inst. Technol.) ; Kraus, H. (Oxford U.) ; Kudryavtsev, V.A. (Sheffield U.) ; Le-Sueur, H. (Orsay) ; Lin, J. (Oxford U.) ; Mancuso, M. (Orsay) ; Marnieros, S. (Orsay) ; Menshikov, A. (Karlsruhe, Inst. Technol.) ; Navick, X.F. (DAPNIA, Saclay) ; Nones, C. (DAPNIA, Saclay) ; Olivieri, E. (Orsay) ; Pari, P. (DSM, DAPNIA, Saclay) ; Paul, B. (DAPNIA, Saclay) ; Piro, M.C. (Orsay) ; Poda, D.V. (Orsay) ; Queguiner, E. (Lyon, IPN) ; Robinson, M. (Sheffield U.) ; Rodenas, H. (Grenoble U., UFR Math.) ; Rozov, S. (Dubna, JINR) ; Sanglard, V. (Lyon, IPN) ; Schmidt, B. (Karlsruhe, Inst. Technol.) ; Scorza, S. (Karlsruhe U., EKP) ; Siebenborn, B. (Karlsruhe, Inst. Technol.) ; Tcherniakhovski, D. (Karlsruhe, Inst. Technol.) ; Vagneron, L. (Lyon, IPN) ; Weber, M. (Karlsruhe, Inst. Technol.) ; Yakushev, E. (Dubna, JINR) ; Zhang, X. (Oxford U.)

Pages: 20

Abstract: We present the results of a search for elastic scattering from galactic dark matter in the form of Weakly Interacting Massive Particles (WIMPs) in the 4-30 GeV/$c^2$ mass range. We make use of a 582 kg-day fiducial exposure from an array of 800 g Germanium bolometers equipped with a set of interleaved electrodes with full surface coverage. We searched specifically for $\sim 2.5-20$ keV nuclear recoils inside the detector fiducial volume. As an illustration the number of observed events in the search for 5 (resp. 20) GeV/$c^2$ WIMPs are 9 (resp. 4), compared to an expected background of 6.1 (resp. 1.4). A 90% CL limit of $4.3\times 10^{-40}$ cm$^2$ (resp. $9.4\times 10^{-44}$ cm$^2$) is set on the spin-independent WIMP-nucleon scattering cross-section for 5 (resp. 20) GeV/$c^2$ WIMPs. This result represents a 41-fold improvement with respect to the previous EDELWEISS-II low-mass WIMP search for 7 GeV/$c^2$ WIMPs. The derived constraint is in tension with hints of WIMP signals from some recent experiments, thus confirming results obtained with different detection techniques.

Web-Page: http://inspirehep.net/record/1428644/files/fid800_drawing.png; http://inspirehep.net/record/1428644/files/biplot_neutron_825_5GeV.png; http://inspirehep.net/record/1428644/files/scatter_combi_5GeV.png; http://inspirehep.net/record/1428644/files/scatter_combi_20GeV.png; http://inspirehep.net/record/1428644/files/limit_result.png; http://inspirehep.net/record/1428644/files/wimpefficiency_comb_20GeV.png; http://inspirehep.net/record/1428644/files/trigger_eff_FID825.png; http://inspirehep.net/record/1428644/files/wimpefficiency_FID825_5GeV.png; http://inspirehep.net/record/1428644/files/bdtdist_824_20GeV.png; http://inspirehep.net/record/1428644/files/betas_825_spectrum.png; http://inspirehep.net/record/1428644/files/bdtdist_825_5GeV.png; http://inspirehep.net/record/1428644/files/betas_825_qdistri.png; http://inspirehep.net/record/1428644/files/arXiv:1603.05120.pdf


Note: 20 pages, 12 figures, submitted to JCAP

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