Temporal distortion of annual modulation at low recoil energies

Details Temporal distortion of annual modulation at low recoil energies Temporal distortion of annual modulation at low recoil energies

2003-01-17

arxiv.org/abs/hep-ph/0301132v1

Phys.Lett. B576 (2003) 189-194

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures, typeset with ReVTeX4. The paper may also be found at http://www.to.infn.it/~fornengo/papers/distortion.ps.

Scientific paper

We show that the main features of the annual modulation of the signal expected in a WIMP direct detection experiment, i.e. its sinusoidal dependence with time, the occurrence of its maxima and minima during the year and (under some circumstances) even the one-year period, may be affected by relaxing the isothermal sphere hypothesis in the description of the WIMP velocity phase space. The most relevant effect is a distortion of the time-behaviour at low recoil energies for anisotropic galactic halos. While some of these effects turn out to be relevant at recoil energies below the current detector thresholds, some others could already be measurable, although some degree of tuning between the WIMP mass and the experimental parameters would be required. Either the observation or non-observation of these effects could provide clues on the phase space distribution of our galactic halo.

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