DAMA and the self similar infall halo model

Abstract

The annual modulation in the rate of WIMP recoils observed by the DAMA collaboration at high significance is often analyzed in the context of an isothermal Maxwell-Boltzmann velocity distribution. While this is the simplest model, there is a need to consider other well motivated theories of halo formation. In this paper, we study a different halo model, that of self similar infall which is characterized by the presence of a number of cold streams and caustics, not seen in simulations. It is shown that the self similar infall model is consistent with the DAMA result both in amplitude and in phase, for WIMP masses exceeding $\approx$ 250 GeV at the 99.7% confidence level. Adding a small thermal component makes the parameter space near $m_{\chi }$ = 12 GeV consistent with the self similar model. The minimum ${\chi }^2$ per degree of freedom is found to be 0.92(1.03) with(without) channeling taken into account, indicating an acceptable fit. For WIMP masses much greater than the mass of the target nucleus, the recoil rate depends only on the ratio ${\sigma }_{\mathrm{p}}/m_{\chi }$ which is found to be $\approx$ 0.06 femtobarn/TeV. However as in the case of the isothermal halo, the allowed parameter space is inconsistent with the null result obtained by the CDMS and Xenon experiments for spin-independent elastic scattering. Future experiments with directional sensitivity and mass bounds from accelerator experiments will help to distinguish between different halo models and/or constrain the contribution from cold flows.

arXiv commentMain conclusions unchanged. Text is expanded, figures and references added. Accepted for publication in Physical Review D, and this replacement reflects the final version

References in corpus (38)

• Supersymmetric Dark Matter
• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• Inelastic Dark Matter
• First Dark Matter Results from the XENON100 Experiment
• A Search for WIMPs with the First Five-Tower Data from CDMS
• Compatibility of DAMA/LIBRA dark matter detection with other searches
• CMB constraints on Dark Matter models with large annihilation cross-section
• Inelastic Dark Matter in Light of DAMA/LIBRA
• Possible implications of the channeling effect in NaI(Tl) crystals
• Annual Modulation of Dark Matter in the Presence of Streams
• The secondary infall model of galactic halo formation and the spectrum of cold dark matter particles on Earth
• Compatibility of DAMA Dark Matter Detection with Other Searches
• Spin-independent elastic WIMP scattering and the DAMA annual modulation signal
• The Effects of the Sagittarius Dwarf Tidal Stream on Dark Matter Detectors
• Detectability of Weakly Interacting Massive Particles in the Sagittarius Dwarf Tidal Stream
• Global interpretation of direct Dark Matter searches after CDMS-II results
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• WIMP Annual Modulation with Opposite Phase in Late-Infall Halo Models
• Interpreting Dark Matter Direct Detection Independently of the Local Velocity and Density Distribution
• The velocity peaks in the cold dark matter spectrum on Earth
• Diurnal and Annual Modulation of Cold Dark Matter Signals
• The caustic ring singularity
• Angular Signatures for Galactic Halo WIMP Scattering in Direct Detectors: Prospects and Challenges
• The Caustic Ring Model of the Milky Way Halo
• Channeling in direct dark matter detection I: channeling fraction in NaI (Tl) crystals
• Evidence for Ring Caustics in the Milky Way
• Signatures of Hierarchical Clustering in Dark Matter Detection Experiments
• Model-Independent Determination of the WIMP Mass from Direct Dark Matter Detection Data
• Reconstructing the Velocity Distribution of WIMPs from Direct Dark Matter Detection Data
• The Inner Caustics of Cold Dark Matter Halos
• Searching for Supersymmetric Dark Matter - The Directional Rate and the Modulation Effect Due to Caustic Rings
• A potential WIMP signature for the caustic ring halo model
• The Phase of the Annual Modulation as a Tool for Determining the WIMP Mass
• Distinguishing standard reionization from dark matter models
• Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology
• Evidence for universal structure in galactic halos
• The Poker Face of Inelastic Dark Matter: Prospects at Upcoming Direct Detection Experiments
• Caustics, cold flows, and annual modulation

Cited by in corpus (1)

• Probing dark matter streams with CoGeNT