The Phase of the Annual Modulation as a Tool for Determining the WIMP Mass

Abstract

The count rate of Weakly Interacting Massive Particle (WIMP) dark matter candidates in direct detection experiments experiences an annual modulation due to the Earth's motion around the Sun. In the standard isothermal halo model, the signal peaks near June 2nd at high recoil energies; however, the signal experiences a phase reversal and peaks in December at low energy recoils. We show that this phase reversal may be used to determine the WIMP mass. If an annual modulation were observed with the usual phase ({\it i.e.}, peaking on June 2nd) in the lowest accessible energy recoil bins of the DAMA, CDMS-II, CRESST-II, EDELWEISS-II, GENIUS-TF, ZEPLIN-II, XENON, or ZEPLIN-IV detectors, one could immediately place upper bounds on the WIMP mass of [103, 48, 6, 97, 10, 52, 29, 29] GeV, respectively. In addition, detectors with adequate energy resolution and sufficiently low recoil energy thresholds may determine the crossover recoil energy at which the phase reverses, thereby obtaining an independent measurement of the WIMP mass. We study the capabilities of various detectors, and find that CRESST-II, ZEPLIN-II, and GENIUS-TF should be able to observe the phase reversal in a few years of runtime, and can thus determine the mass of the WIMP if it is $\mathcal{O}(100$ GeV). Xenon based detectors with 1000 kg (XENON and ZEPLIN-IV) and with energy recoil thresholds of a few keV require 25 kg-yr exposure, which will be readily attained in upcoming experiments.

15 pages. Four Figures. Accepted for publication in Phys. Rev. D

References in corpus (10)

• Supersymmetric Dark Matter in Light of WMAP
• Improved Exclusion Limits from the EDELWEISS WIMP Search
• The Effects of the Sagittarius Dwarf Tidal Stream on Dark Matter Detectors
• Detectability of Weakly Interacting Massive Particles in the Sagittarius Dwarf Tidal Stream
• Accurate relic densities with neutralino, chargino and sfermion coannihilations in mSUGRA
• Recoil momentum spectrum in directional dark matter detectors
• Effect of realistic astrophysical inputs on the phase and shape of the WIMP annual modulation signal
• Temporal distortion of annual modulation at low recoil energies
• First Results from the HDMS experiment in the Final Setup
• Expected Performance of CryoArray

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