The unbearable lightness of being: CDMS versus XENON

Abstract

The CDMS-II collaboration has reported 3 events in a Si detector, which are consistent with being nuclear recoils due to scattering of Galactic dark matter particles with a mass of about 8.6 GeV and a cross-section on neutrons of about 2 x 10^-41 cm^2. While a previous result from the XENON10 experiment has supposedly ruled out such particles as dark matter, we find by reanalysing the XENON10 data that this is not the case. Some tension remains however with the upper limit placed by the XENON100 experiment, independently of astrophysical uncertainties concerning the Galactic dark matter distribution. We explore possible ways of ameliorating this tension by altering the properties of dark matter interactions. Nevertheless, even with standard couplings, light dark matter is consistent with both CDMS and XENON10/100.

15 pages, 7 figures. v2: minor changes, references added - accepted for publication in JCAP

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• Dark Matter Results from 225 Live Days of XENON100 Data
• New results from DAMA/LIBRA
• Results from a Low-Energy Analysis of the CDMS II Germanium Data
• The Astrophysical Uncertainties Of Dark Matter Direct Detection Experiments
• Electromagnetic properties of dark matter: dipole moments and charge form factor
• Exothermic Dark Matter
• Low-threshold analysis of CDMS shallow-site data
• Interpreting Dark Matter Direct Detection Independently of the Local Velocity and Density Distribution
• XENON10/100 dark matter constraints in comparison with CoGeNT and DAMA: examining the Leff dependence
• Response of the XENON100 Dark Matter Detector to Nuclear Recoils
• Silicon detector results from the first five-tower run of CDMS II
• Direct Detection of Dark Matter Electromagnetic Dipole Moments

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