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      Results from a Search for Light-Mass Dark Matter with a P-type Point Contact Germanium Detector

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          Abstract

          We report on several features present in the energy spectrum from an ultra low-noise germanium detector operated at 2,100 m.w.e. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss several possible causes for an irreducible excess of bulk-like events below 3 keVee, including a dark matter candidate common to the DAMA/LIBRA annual modulation effect, the hint of a signal in CDMS, and phenomenological predictions. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.

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          Asymmetric Dark Matter

          Markus Luty, Kathryn Zurek, David E Kaplan (2009)
          We consider a simple class of models in which the relic density of dark matter is determined by the baryon asymmetry of the universe. In these models a \(B - L\) asymmetry generated at high temperatures is transfered to the dark matter, which is charged under \(B - L\). The interactions that transfer the asymmetry decouple at temperatures above the dark matter mass, freezing in a dark matter asymmetry of order the baryon asymmetry. This explains the observed relation between the baryon and dark matter densities for dark matter mass in the range 5--15 GeV. The symmetric component of the dark matter can annihilate efficiently to light pseudoscalar Higgs particles \(a\), or via \(t\)-channel exchange of new scalar doublets. The first possibility allows for \(h^0 \to aa\) decays, while the second predicts a light charged Higgs-like scalar decaying to \(\tau\nu\). Direct detection can arise from Higgs exchange in the first model, or a nonzero magnetic moment in the second. In supersymmetric models, the would-be LSP can decay into pairs of dark matter particles plus standard model particles, possibly with displaced vertices.
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            First results from DAMA/LIBRA and the combined results with DAMA/NaI

            P Belli, H. H. Kuang, F Nozzoli … (2008)
            The highly radiopure \(\simeq\) 250 kg NaI(Tl) DAMA/LIBRA set-up is running at the Gran Sasso National Laboratory of the I.N.F.N.. In this paper the first result obtained by exploiting the model independent annual modulation signature for Dark Matter (DM) particles is presented. It refers to an exposure of 0.53 ton\(\times\)yr. The collected DAMA/LIBRA data satisfy all the many peculiarities of the DM annual modulation signature. Neither systematic effects nor side reactions can account for the observed modulation amplitude and contemporaneously satisfy all the several requirements of this DM signature. Thus, the presence of Dark Matter particles in the galactic halo is supported also by DAMA/LIBRA and, considering the former DAMA/NaI and the present DAMA/LIBRA data all together (total exposure 0.82 ton\(\times\)yr), the presence of Dark Matter particles in the galactic halo is supported at 8.2 \(\sigma\) C.L..
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              The WIMPless Miracle: Dark Matter Particles without Weak-scale Masses or Weak Interactions

              Jonathan L. Feng, Jason Kumar (2008)
              We propose that dark matter is composed of particles that naturally have the correct thermal relic density, but have neither weak-scale masses nor weak interactions. These WIMPless models emerge naturally from gauge-mediated supersymmetry breaking, where they elegantly solve the dark matter problem. The framework accommodates single or multiple component dark matter, dark matter masses from 10 MeV to 10 TeV, and interaction strengths from gravitational to strong. These candidates enhance many direct and indirect signals relative to WIMPs and have qualitatively new implications for dark matter searches and cosmological implications for colliders.
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                Author and article information

                Journal
                Publication date Created: 25 February 2010
                Publication date Updated: 2010-03-15
                Article
                DOI: 10.1103/PhysRevLett.106.131301
                ArXiV ID: 1002.4703
                SO-VID: 64fba52e-e275-47a9-89f3-8cdac6200e8a
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                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Journal reference Phys.Rev.Lett.106:131301,2011
                Comments 4 pages, 4 figures. v2: submitted version. Minimal changes in wording, one reference added
                Categories astro-ph.CO hep-ex physics.ins-det

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